diff options
Diffstat (limited to 'src/3rdparty/libwebp/src/demux')
-rw-r--r-- | src/3rdparty/libwebp/src/demux/anim_decode.c | 12 | ||||
-rw-r--r-- | src/3rdparty/libwebp/src/demux/demux.c | 18 |
2 files changed, 22 insertions, 8 deletions
diff --git a/src/3rdparty/libwebp/src/demux/anim_decode.c b/src/3rdparty/libwebp/src/demux/anim_decode.c index 3dcacc3..2bf4dcf 100644 --- a/src/3rdparty/libwebp/src/demux/anim_decode.c +++ b/src/3rdparty/libwebp/src/demux/anim_decode.c @@ -87,11 +87,19 @@ WebPAnimDecoder* WebPAnimDecoderNewInternal( int abi_version) { WebPAnimDecoderOptions options; WebPAnimDecoder* dec = NULL; + WebPBitstreamFeatures features; if (webp_data == NULL || WEBP_ABI_IS_INCOMPATIBLE(abi_version, WEBP_DEMUX_ABI_VERSION)) { return NULL; } + // Validate the bitstream before doing expensive allocations. The demuxer may + // be more tolerant than the decoder. + if (WebPGetFeatures(webp_data->bytes, webp_data->size, &features) != + VP8_STATUS_OK) { + return NULL; + } + // Note: calloc() so that the pointer members are initialized to NULL. dec = (WebPAnimDecoder*)WebPSafeCalloc(1ULL, sizeof(*dec)); if (dec == NULL) goto Error; @@ -145,7 +153,7 @@ static int ZeroFillCanvas(uint8_t* buf, uint32_t canvas_width, uint32_t canvas_height) { const uint64_t size = (uint64_t)canvas_width * canvas_height * NUM_CHANNELS * sizeof(*buf); - if (size != (size_t)size) return 0; + if (!CheckSizeOverflow(size)) return 0; memset(buf, 0, (size_t)size); return 1; } @@ -166,7 +174,7 @@ static void ZeroFillFrameRect(uint8_t* buf, int buf_stride, int x_offset, static int CopyCanvas(const uint8_t* src, uint8_t* dst, uint32_t width, uint32_t height) { const uint64_t size = (uint64_t)width * height * NUM_CHANNELS; - if (size != (size_t)size) return 0; + if (!CheckSizeOverflow(size)) return 0; assert(src != NULL && dst != NULL); memcpy(dst, src, (size_t)size); return 1; diff --git a/src/3rdparty/libwebp/src/demux/demux.c b/src/3rdparty/libwebp/src/demux/demux.c index 860e2ce..547a772 100644 --- a/src/3rdparty/libwebp/src/demux/demux.c +++ b/src/3rdparty/libwebp/src/demux/demux.c @@ -25,7 +25,7 @@ #define DMUX_MAJ_VERSION 1 #define DMUX_MIN_VERSION 2 -#define DMUX_REV_VERSION 0 +#define DMUX_REV_VERSION 1 typedef struct { size_t start_; // start location of the data @@ -221,12 +221,16 @@ static ParseStatus StoreFrame(int frame_num, uint32_t min_size, const size_t chunk_start_offset = mem->start_; const uint32_t fourcc = ReadLE32(mem); const uint32_t payload_size = ReadLE32(mem); - const uint32_t payload_size_padded = payload_size + (payload_size & 1); - const size_t payload_available = (payload_size_padded > MemDataSize(mem)) - ? MemDataSize(mem) : payload_size_padded; - const size_t chunk_size = CHUNK_HEADER_SIZE + payload_available; + uint32_t payload_size_padded; + size_t payload_available; + size_t chunk_size; if (payload_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR; + + payload_size_padded = payload_size + (payload_size & 1); + payload_available = (payload_size_padded > MemDataSize(mem)) + ? MemDataSize(mem) : payload_size_padded; + chunk_size = CHUNK_HEADER_SIZE + payload_available; if (SizeIsInvalid(mem, payload_size_padded)) return PARSE_ERROR; if (payload_size_padded > MemDataSize(mem)) status = PARSE_NEED_MORE_DATA; @@ -451,9 +455,11 @@ static ParseStatus ParseVP8XChunks(WebPDemuxer* const dmux) { const size_t chunk_start_offset = mem->start_; const uint32_t fourcc = ReadLE32(mem); const uint32_t chunk_size = ReadLE32(mem); - const uint32_t chunk_size_padded = chunk_size + (chunk_size & 1); + uint32_t chunk_size_padded; if (chunk_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR; + + chunk_size_padded = chunk_size + (chunk_size & 1); if (SizeIsInvalid(mem, chunk_size_padded)) return PARSE_ERROR; switch (fourcc) { |