X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb_decode.c;h=b21bfe37f37c854cf7898f95f5f4e1ab9e246ebc;hb=1f86b707e3a845f2c403e77173d0859dbf6aa4b0;hp=8b782a6f2407049e5088940fdf3ccc0ebabea52b;hpb=8a857a7f7519414c2294cc9f3286ebe5dba5a6f3;p=apps%2Fagl-service-can-low-level.git diff --git a/pb_decode.c b/pb_decode.c index 8b782a6f..b21bfe37 100644 --- a/pb_decode.c +++ b/pb_decode.c @@ -15,36 +15,25 @@ #include "pb.h" #include "pb_decode.h" +#include "pb_common.h" /************************************** * Declarations internal to this file * **************************************/ -/* Iterator for pb_field_t list */ -typedef struct { - const pb_field_t *start; /* Start of the pb_field_t array */ - const pb_field_t *pos; /* Current position of the iterator */ - unsigned field_index; /* Zero-based index of the field. */ - unsigned required_field_index; /* Zero-based index that counts only the required fields */ - void *dest_struct; /* Pointer to the destination structure to decode to */ - void *pData; /* Pointer where to store current field value */ - void *pSize; /* Pointer where to store the size of current array field */ -} pb_field_iterator_t; - typedef bool (*pb_decoder_t)(pb_istream_t *stream, const pb_field_t *field, void *dest) checkreturn; static bool checkreturn buf_read(pb_istream_t *stream, uint8_t *buf, size_t count); static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest); static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, uint8_t *buf, size_t *size); -static void pb_field_init(pb_field_iterator_t *iter, const pb_field_t *fields, void *dest_struct); -static bool pb_field_next(pb_field_iterator_t *iter); -static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag); -static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); -static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); -static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); +static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter); +static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter); +static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter); +static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension); static bool checkreturn default_extension_decoder(pb_istream_t *stream, pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type); -static bool checkreturn decode_extension(pb_istream_t *stream, uint32_t tag, pb_wire_type_t wire_type, pb_field_iterator_t *iter); -static bool checkreturn find_extension_field(pb_field_iterator_t *iter); +static bool checkreturn decode_extension(pb_istream_t *stream, uint32_t tag, pb_wire_type_t wire_type, pb_field_iter_t *iter); +static bool checkreturn find_extension_field(pb_field_iter_t *iter); +static void pb_field_set_to_default(pb_field_iter_t *iter); static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct); static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest); @@ -57,6 +46,12 @@ static bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t static bool checkreturn pb_skip_varint(pb_istream_t *stream); static bool checkreturn pb_skip_string(pb_istream_t *stream); +#ifdef PB_ENABLE_MALLOC +static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size); +static bool checkreturn pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter); +static void pb_release_single_field(const pb_field_iter_t *iter); +#endif + /* --- Function pointers to field decoders --- * Order in the array must match pb_action_t LTYPE numbering. */ @@ -338,75 +333,11 @@ void pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream) #endif } -static void pb_field_init(pb_field_iterator_t *iter, const pb_field_t *fields, void *dest_struct) -{ - iter->start = iter->pos = fields; - iter->field_index = 0; - iter->required_field_index = 0; - iter->pData = (char*)dest_struct + iter->pos->data_offset; - iter->pSize = (char*)iter->pData + iter->pos->size_offset; - iter->dest_struct = dest_struct; -} - -static bool pb_field_next(pb_field_iterator_t *iter) -{ - bool notwrapped = true; - size_t prev_size = iter->pos->data_size; - - if (PB_ATYPE(iter->pos->type) == PB_ATYPE_STATIC && - PB_HTYPE(iter->pos->type) == PB_HTYPE_REPEATED) - { - prev_size *= iter->pos->array_size; - } - else if (PB_ATYPE(iter->pos->type) == PB_ATYPE_POINTER) - { - prev_size = sizeof(void*); - } - - if (iter->pos->tag == 0) - return false; /* Only happens with empty message types */ - - if (PB_HTYPE(iter->pos->type) == PB_HTYPE_REQUIRED) - iter->required_field_index++; - - iter->pos++; - iter->field_index++; - if (iter->pos->tag == 0) - { - iter->pos = iter->start; - iter->field_index = 0; - iter->required_field_index = 0; - iter->pData = iter->dest_struct; - prev_size = 0; - notwrapped = false; - } - - iter->pData = (char*)iter->pData + prev_size + iter->pos->data_offset; - iter->pSize = (char*)iter->pData + iter->pos->size_offset; - return notwrapped; -} - -static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag) -{ - unsigned start = iter->field_index; - - do { - if (iter->pos->tag == tag && - PB_LTYPE(iter->pos->type) != PB_LTYPE_EXTENSION) - { - return true; - } - (void)pb_field_next(iter); - } while (iter->field_index != start); - - return false; -} - /************************* * Decode a single field * *************************/ -static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) +static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter) { pb_type_t type; pb_decoder_t func; @@ -429,7 +360,7 @@ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t { /* Packed array */ bool status = true; - size_t *size = (size_t*)iter->pSize; + pb_size_t *size = (pb_size_t*)iter->pSize; pb_istream_t substream; if (!pb_make_string_substream(stream, &substream)) return false; @@ -454,7 +385,7 @@ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t else { /* Repeated field */ - size_t *size = (size_t*)iter->pSize; + pb_size_t *size = (pb_size_t*)iter->pSize; void *pItem = (uint8_t*)iter->pData + iter->pos->data_size * (*size); if (*size >= iter->pos->array_size) PB_RETURN_ERROR(stream, "array overflow"); @@ -463,6 +394,17 @@ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t return func(stream, iter->pos, pItem); } + case PB_HTYPE_ONEOF: + *(pb_size_t*)iter->pSize = iter->pos->tag; + if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE) + { + /* We memset to zero so that any callbacks are set to NULL. + * Then set any default values. */ + memset(iter->pData, 0, iter->pos->data_size); + pb_message_set_to_defaults((const pb_field_t*)iter->pos->ptr, iter->pData); + } + return func(stream, iter->pos, iter->pData); + default: PB_RETURN_ERROR(stream, "invalid field type"); } @@ -471,19 +413,21 @@ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t #ifdef PB_ENABLE_MALLOC /* Allocate storage for the field and store the pointer at iter->pData. * array_size is the number of entries to reserve in an array. + * Zero size is not allowed, use pb_free() for releasing. */ static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size) { void *ptr = *(void**)pData; - /* Check for multiplication overflows. */ - size_t size = 0; - if (data_size > 0 && array_size > 0) + if (data_size == 0 || array_size == 0) + PB_RETURN_ERROR(stream, "invalid size"); + + /* Check for multiplication overflows. + * This code avoids the costly division if the sizes are small enough. + * Multiplication is safe as long as only half of bits are set + * in either multiplicand. + */ { - /* Avoid the costly division if the sizes are small enough. - * Multiplication is safe as long as only half of bits are set - * in either multiplicand. - */ const size_t check_limit = (size_t)1 << (sizeof(size_t) * 4); if (data_size >= check_limit || array_size >= check_limit) { @@ -493,14 +437,12 @@ static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t PB_RETURN_ERROR(stream, "size too large"); } } - - size = array_size * data_size; } /* Allocate new or expand previous allocation */ /* Note: on failure the old pointer will remain in the structure, * the message must be freed by caller also on error return. */ - ptr = pb_realloc(ptr, size); + ptr = pb_realloc(ptr, array_size * data_size); if (ptr == NULL) PB_RETURN_ERROR(stream, "realloc failed"); @@ -509,7 +451,7 @@ static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t } /* Clear a newly allocated item in case it contains a pointer, or is a submessage. */ -static void initialize_pointer_field(void *pItem, pb_field_iterator_t *iter) +static void initialize_pointer_field(void *pItem, pb_field_iter_t *iter) { if (PB_LTYPE(iter->pos->type) == PB_LTYPE_STRING || PB_LTYPE(iter->pos->type) == PB_LTYPE_BYTES) @@ -523,11 +465,11 @@ static void initialize_pointer_field(void *pItem, pb_field_iterator_t *iter) } #endif -static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) +static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter) { #ifndef PB_ENABLE_MALLOC - UNUSED(wire_type); - UNUSED(iter); + PB_UNUSED(wire_type); + PB_UNUSED(iter); PB_RETURN_ERROR(stream, "no malloc support"); #else pb_type_t type; @@ -540,6 +482,19 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ { case PB_HTYPE_REQUIRED: case PB_HTYPE_OPTIONAL: + case PB_HTYPE_ONEOF: + if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE && + *(void**)iter->pData != NULL) + { + /* Duplicate field, have to release the old allocation first. */ + pb_release_single_field(iter); + } + + if (PB_HTYPE(type) == PB_HTYPE_ONEOF) + { + *(pb_size_t*)iter->pSize = iter->pos->tag; + } + if (PB_LTYPE(type) == PB_LTYPE_STRING || PB_LTYPE(type) == PB_LTYPE_BYTES) { @@ -560,7 +515,7 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ { /* Packed array, multiple items come in at once. */ bool status = true; - size_t *size = (size_t*)iter->pSize; + pb_size_t *size = (pb_size_t*)iter->pSize; size_t allocated_size = *size; void *pItem; pb_istream_t substream; @@ -570,7 +525,7 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ while (substream.bytes_left) { - if (*size + 1 > allocated_size) + if ((size_t)*size + 1 > allocated_size) { /* Allocate more storage. This tries to guess the * number of remaining entries. Round the division @@ -592,6 +547,16 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ status = false; break; } + + if (*size == PB_SIZE_MAX) + { +#ifndef PB_NO_ERRMSG + stream->errmsg = "too many array entries"; +#endif + status = false; + break; + } + (*size)++; } pb_close_string_substream(stream, &substream); @@ -601,9 +566,12 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ else { /* Normal repeated field, i.e. only one item at a time. */ - size_t *size = (size_t*)iter->pSize; + pb_size_t *size = (pb_size_t*)iter->pSize; void *pItem; + if (*size == PB_SIZE_MAX) + PB_RETURN_ERROR(stream, "too many array entries"); + (*size)++; if (!allocate_field(stream, iter->pData, iter->pos->data_size, *size)) return false; @@ -612,14 +580,14 @@ static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_ initialize_pointer_field(pItem, iter); return func(stream, iter->pos, pItem); } - + default: PB_RETURN_ERROR(stream, "invalid field type"); } #endif } -static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) +static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter) { pb_callback_t *pCallback = (pb_callback_t*)iter->pData; @@ -666,8 +634,18 @@ static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type } } -static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) +static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter) { +#ifdef PB_ENABLE_MALLOC + /* When decoding an oneof field, check if there is old data that must be + * released first. */ + if (PB_HTYPE(iter->pos->type) == PB_HTYPE_ONEOF) + { + if (!pb_release_union_field(stream, iter)) + return false; + } +#endif + switch (PB_ATYPE(iter->pos->type)) { case PB_ATYPE_STATIC: @@ -684,32 +662,45 @@ static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_t } } +static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension) +{ + /* Fake a field iterator for the extension field. + * It is not actually safe to advance this iterator, but decode_field + * will not even try to. */ + const pb_field_t *field = (const pb_field_t*)extension->type->arg; + (void)pb_field_iter_begin(iter, field, extension->dest); + iter->pData = extension->dest; + iter->pSize = &extension->found; + + if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) + { + /* For pointer extensions, the pointer is stored directly + * in the extension structure. This avoids having an extra + * indirection. */ + iter->pData = &extension->dest; + } +} + /* Default handler for extension fields. Expects a pb_field_t structure * in extension->type->arg. */ static bool checkreturn default_extension_decoder(pb_istream_t *stream, pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type) { const pb_field_t *field = (const pb_field_t*)extension->type->arg; - pb_field_iterator_t iter; + pb_field_iter_t iter; if (field->tag != tag) return true; - iter.start = field; - iter.pos = field; - iter.field_index = 0; - iter.required_field_index = 0; - iter.dest_struct = extension->dest; - iter.pData = extension->dest; - iter.pSize = &extension->found; - + iter_from_extension(&iter, extension); + extension->found = true; return decode_field(stream, wire_type, &iter); } /* Try to decode an unknown field as an extension field. Tries each extension * decoder in turn, until one of them handles the field or loop ends. */ static bool checkreturn decode_extension(pb_istream_t *stream, - uint32_t tag, pb_wire_type_t wire_type, pb_field_iterator_t *iter) + uint32_t tag, pb_wire_type_t wire_type, pb_field_iter_t *iter) { pb_extension_t *extension = *(pb_extension_t* const *)iter->pData; size_t pos = stream->bytes_left; @@ -734,81 +725,103 @@ static bool checkreturn decode_extension(pb_istream_t *stream, /* Step through the iterator until an extension field is found or until all * entries have been checked. There can be only one extension field per * message. Returns false if no extension field is found. */ -static bool checkreturn find_extension_field(pb_field_iterator_t *iter) +static bool checkreturn find_extension_field(pb_field_iter_t *iter) { - unsigned start = iter->field_index; + const pb_field_t *start = iter->pos; do { if (PB_LTYPE(iter->pos->type) == PB_LTYPE_EXTENSION) return true; - (void)pb_field_next(iter); - } while (iter->field_index != start); + (void)pb_field_iter_next(iter); + } while (iter->pos != start); return false; } /* Initialize message fields to default values, recursively */ -static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct) +static void pb_field_set_to_default(pb_field_iter_t *iter) { - pb_field_iterator_t iter; - pb_field_init(&iter, fields, dest_struct); + pb_type_t type; + type = iter->pos->type; - do + if (PB_LTYPE(type) == PB_LTYPE_EXTENSION) { - pb_type_t type; - type = iter.pos->type; - - /* Avoid crash on empty message types (zero fields) */ - if (iter.pos->tag == 0) - continue; - - if (PB_ATYPE(type) == PB_ATYPE_STATIC) + pb_extension_t *ext = *(pb_extension_t* const *)iter->pData; + while (ext != NULL) { - if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL) - { - /* Set has_field to false. Still initialize the optional field - * itself also. */ - *(bool*)iter.pSize = false; - } - else if (PB_HTYPE(type) == PB_HTYPE_REPEATED) - { - /* Set array count to 0, no need to initialize contents. */ - *(size_t*)iter.pSize = 0; - continue; - } - - if (PB_LTYPE(iter.pos->type) == PB_LTYPE_SUBMESSAGE) + pb_field_iter_t ext_iter; + ext->found = false; + iter_from_extension(&ext_iter, ext); + pb_field_set_to_default(&ext_iter); + ext = ext->next; + } + } + else if (PB_ATYPE(type) == PB_ATYPE_STATIC) + { + bool init_data = true; + if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL) + { + /* Set has_field to false. Still initialize the optional field + * itself also. */ + *(bool*)iter->pSize = false; + } + else if (PB_HTYPE(type) == PB_HTYPE_REPEATED || + PB_HTYPE(type) == PB_HTYPE_ONEOF) + { + /* REPEATED: Set array count to 0, no need to initialize contents. + ONEOF: Set which_field to 0. */ + *(pb_size_t*)iter->pSize = 0; + init_data = false; + } + + if (init_data) + { + if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE) { /* Initialize submessage to defaults */ - pb_message_set_to_defaults((const pb_field_t *) iter.pos->ptr, iter.pData); + pb_message_set_to_defaults((const pb_field_t *) iter->pos->ptr, iter->pData); } - else if (iter.pos->ptr != NULL) + else if (iter->pos->ptr != NULL) { /* Initialize to default value */ - memcpy(iter.pData, iter.pos->ptr, iter.pos->data_size); + memcpy(iter->pData, iter->pos->ptr, iter->pos->data_size); } else { /* Initialize to zeros */ - memset(iter.pData, 0, iter.pos->data_size); - } - } - else if (PB_ATYPE(type) == PB_ATYPE_POINTER) - { - /* Initialize the pointer to NULL. */ - *(void**)iter.pData = NULL; - - /* Initialize array count to 0. */ - if (PB_HTYPE(type) == PB_HTYPE_REPEATED) - { - *(size_t*)iter.pSize = 0; + memset(iter->pData, 0, iter->pos->data_size); } } - else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK) + } + else if (PB_ATYPE(type) == PB_ATYPE_POINTER) + { + /* Initialize the pointer to NULL. */ + *(void**)iter->pData = NULL; + + /* Initialize array count to 0. */ + if (PB_HTYPE(type) == PB_HTYPE_REPEATED || + PB_HTYPE(type) == PB_HTYPE_ONEOF) { - /* Don't overwrite callback */ + *(pb_size_t*)iter->pSize = 0; } - } while (pb_field_next(&iter)); + } + else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK) + { + /* Don't overwrite callback */ + } +} + +static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct) +{ + pb_field_iter_t iter; + + if (!pb_field_iter_begin(&iter, fields, dest_struct)) + return; /* Empty message type */ + + do + { + pb_field_set_to_default(&iter); + } while (pb_field_iter_next(&iter)); } /********************* @@ -819,9 +832,11 @@ bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[ { uint8_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 7) / 8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t extension_range_start = 0; - pb_field_iterator_t iter; + pb_field_iter_t iter; - pb_field_init(&iter, fields, dest_struct); + /* Return value ignored, as empty message types will be correctly handled by + * pb_field_iter_find() anyway. */ + (void)pb_field_iter_begin(&iter, fields, dest_struct); while (stream->bytes_left) { @@ -837,7 +852,7 @@ bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[ return false; } - if (!pb_field_find(&iter, tag)) + if (!pb_field_iter_find(&iter, tag)) { /* No match found, check if it matches an extension. */ if (tag >= extension_range_start) @@ -890,7 +905,7 @@ bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[ do { req_field_count = iter.required_field_index; last_type = iter.pos->type; - } while (pb_field_next(&iter)); + } while (pb_field_iter_next(&iter)); /* Fixup if last field was also required. */ if (PB_HTYPE(last_type) == PB_HTYPE_REQUIRED && iter.pos->tag != 0) @@ -939,58 +954,125 @@ bool pb_decode_delimited(pb_istream_t *stream, const pb_field_t fields[], void * } #ifdef PB_ENABLE_MALLOC -void pb_release(const pb_field_t fields[], void *dest_struct) +/* Given an oneof field, if there has already been a field inside this oneof, + * release it before overwriting with a different one. */ +static bool pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter) { - pb_field_iterator_t iter; - pb_field_init(&iter, fields, dest_struct); + pb_size_t old_tag = *(pb_size_t*)iter->pSize; /* Previous which_ value */ + pb_size_t new_tag = iter->pos->tag; /* New which_ value */ + + if (old_tag == 0) + return true; /* Ok, no old data in union */ + + if (old_tag == new_tag) + return true; /* Ok, old data is of same type => merge */ + + /* Release old data. The find can fail if the message struct contains + * invalid data. */ + if (!pb_field_iter_find(iter, old_tag)) + PB_RETURN_ERROR(stream, "invalid union tag"); + + pb_release_single_field(iter); + + /* Restore iterator to where it should be. + * This shouldn't fail unless the pb_field_t structure is corrupted. */ + if (!pb_field_iter_find(iter, new_tag)) + PB_RETURN_ERROR(stream, "iterator error"); - do + return true; +} + +static void pb_release_single_field(const pb_field_iter_t *iter) +{ + pb_type_t type; + type = iter->pos->type; + + if (PB_HTYPE(type) == PB_HTYPE_ONEOF) { - pb_type_t type; - type = iter.pos->type; - - /* Avoid crash on empty message types (zero fields) */ - if (iter.pos->tag == 0) - continue; + if (*(pb_size_t*)iter->pSize != iter->pos->tag) + return; /* This is not the current field in the union */ + } + + /* Release anything contained inside an extension or submsg. + * This has to be done even if the submsg itself is statically + * allocated. */ + if (PB_LTYPE(type) == PB_LTYPE_EXTENSION) + { + /* Release fields from all extensions in the linked list */ + pb_extension_t *ext = *(pb_extension_t**)iter->pData; + while (ext != NULL) + { + pb_field_iter_t ext_iter; + iter_from_extension(&ext_iter, ext); + pb_release_single_field(&ext_iter); + ext = ext->next; + } + } + else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE) + { + /* Release fields in submessage or submsg array */ + void *pItem = iter->pData; + pb_size_t count = 1; if (PB_ATYPE(type) == PB_ATYPE_POINTER) { - if (PB_HTYPE(type) == PB_HTYPE_REPEATED && - (PB_LTYPE(type) == PB_LTYPE_STRING || - PB_LTYPE(type) == PB_LTYPE_BYTES)) + pItem = *(void**)iter->pData; + } + + if (PB_HTYPE(type) == PB_HTYPE_REPEATED) + { + count = *(pb_size_t*)iter->pSize; + } + + if (pItem) + { + while (count--) { - /* Release entries in repeated string or bytes array */ - void **pItem = *(void***)iter.pData; - size_t count = *(size_t*)iter.pSize; - while (count--) - { - pb_free(*pItem); - *pItem++ = NULL; - } + pb_release((const pb_field_t*)iter->pos->ptr, pItem); + pItem = (uint8_t*)pItem + iter->pos->data_size; } - else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE) + } + } + + if (PB_ATYPE(type) == PB_ATYPE_POINTER) + { + if (PB_HTYPE(type) == PB_HTYPE_REPEATED && + (PB_LTYPE(type) == PB_LTYPE_STRING || + PB_LTYPE(type) == PB_LTYPE_BYTES)) + { + /* Release entries in repeated string or bytes array */ + void **pItem = *(void***)iter->pData; + pb_size_t count = *(pb_size_t*)iter->pSize; + while (count--) { - /* Release fields in submessages */ - void *pItem = *(void**)iter.pData; - size_t count = (pItem ? 1 : 0); - - if (PB_HTYPE(type) == PB_HTYPE_REPEATED) - { - count = *(size_t*)iter.pSize; - } - - while (count--) - { - pb_release((const pb_field_t*)iter.pos->ptr, pItem); - pItem = (uint8_t*)pItem + iter.pos->data_size; - } + pb_free(*pItem); + *pItem++ = NULL; } - - /* Release main item */ - pb_free(*(void**)iter.pData); - *(void**)iter.pData = NULL; } - } while (pb_field_next(&iter)); + + if (PB_HTYPE(type) == PB_HTYPE_REPEATED) + { + /* We are going to release the array, so set the size to 0 */ + *(pb_size_t*)iter->pSize = 0; + } + + /* Release main item */ + pb_free(*(void**)iter->pData); + *(void**)iter->pData = NULL; + } +} + +void pb_release(const pb_field_t fields[], void *dest_struct) +{ + pb_field_iter_t iter; + + if (!pb_field_iter_begin(&iter, fields, dest_struct)) + return; /* Empty message type */ + + do + { + pb_release_single_field(&iter); + } while (pb_field_iter_next(&iter)); } #endif @@ -1055,91 +1137,125 @@ bool pb_decode_fixed64(pb_istream_t *stream, void *dest) static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest) { uint64_t value; + int64_t svalue; + int64_t clamped; if (!pb_decode_varint(stream, &value)) return false; + /* See issue 97: Google's C++ protobuf allows negative varint values to + * be cast as int32_t, instead of the int64_t that should be used when + * encoding. Previous nanopb versions had a bug in encoding. In order to + * not break decoding of such messages, we cast <=32 bit fields to + * int32_t first to get the sign correct. + */ + if (field->data_size == 8) + svalue = (int64_t)value; + else + svalue = (int32_t)value; + switch (field->data_size) { - case 1: *(int8_t*)dest = (int8_t)value; break; - case 2: *(int16_t*)dest = (int16_t)value; break; - case 4: *(int32_t*)dest = (int32_t)value; break; - case 8: *(int64_t*)dest = (int64_t)value; break; + case 1: clamped = *(int8_t*)dest = (int8_t)svalue; break; + case 2: clamped = *(int16_t*)dest = (int16_t)svalue; break; + case 4: clamped = *(int32_t*)dest = (int32_t)svalue; break; + case 8: clamped = *(int64_t*)dest = svalue; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } + + if (clamped != svalue) + PB_RETURN_ERROR(stream, "integer too large"); return true; } static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest) { - uint64_t value; + uint64_t value, clamped; if (!pb_decode_varint(stream, &value)) return false; switch (field->data_size) { - case 4: *(uint32_t*)dest = (uint32_t)value; break; - case 8: *(uint64_t*)dest = value; break; + case 1: clamped = *(uint8_t*)dest = (uint8_t)value; break; + case 2: clamped = *(uint16_t*)dest = (uint16_t)value; break; + case 4: clamped = *(uint32_t*)dest = (uint32_t)value; break; + case 8: clamped = *(uint64_t*)dest = value; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } + if (clamped != value) + PB_RETURN_ERROR(stream, "integer too large"); + return true; } static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest) { - int64_t value; + int64_t value, clamped; if (!pb_decode_svarint(stream, &value)) return false; switch (field->data_size) { - case 4: *(int32_t*)dest = (int32_t)value; break; - case 8: *(int64_t*)dest = value; break; + case 1: clamped = *(int8_t*)dest = (int8_t)value; break; + case 2: clamped = *(int16_t*)dest = (int16_t)value; break; + case 4: clamped = *(int32_t*)dest = (int32_t)value; break; + case 8: clamped = *(int64_t*)dest = value; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } + + if (clamped != value) + PB_RETURN_ERROR(stream, "integer too large"); return true; } static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest) { - UNUSED(field); + PB_UNUSED(field); return pb_decode_fixed32(stream, dest); } static bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest) { - UNUSED(field); + PB_UNUSED(field); return pb_decode_fixed64(stream, dest); } static bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest) { uint32_t size; + size_t alloc_size; pb_bytes_array_t *bdest; if (!pb_decode_varint32(stream, &size)) return false; + if (size > PB_SIZE_MAX) + PB_RETURN_ERROR(stream, "bytes overflow"); + + alloc_size = PB_BYTES_ARRAY_T_ALLOCSIZE(size); + if (size > alloc_size) + PB_RETURN_ERROR(stream, "size too large"); + if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) { #ifndef PB_ENABLE_MALLOC PB_RETURN_ERROR(stream, "no malloc support"); #else - if (!allocate_field(stream, dest, PB_BYTES_ARRAY_T_ALLOCSIZE(size), 1)) + if (!allocate_field(stream, dest, alloc_size, 1)) return false; bdest = *(pb_bytes_array_t**)dest; #endif } else { - if (PB_BYTES_ARRAY_T_ALLOCSIZE(size) > field->data_size) + if (alloc_size > field->data_size) PB_RETURN_ERROR(stream, "bytes overflow"); bdest = (pb_bytes_array_t*)dest; } - - bdest->size = size; + + bdest->size = (pb_size_t)size; return pb_read(stream, bdest->bytes, size); } @@ -1154,6 +1270,9 @@ static bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *fi /* Space for null terminator */ alloc_size = size + 1; + if (alloc_size < size) + PB_RETURN_ERROR(stream, "size too large"); + if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) { #ifndef PB_ENABLE_MALLOC