fix read-overflow while parsing VP8X chunk
The available size was not checked before parsing the VP8X data
@@ -264,6 +264,7 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
chunk_list = MuxGetChunkListFromId(mux, id); // List to add this chunk.
if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
if (id == WEBP_CHUNK_VP8X) { // grab global specs
+ if (data_size < CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE) goto Err;
mux->canvas_width_ = GetLE24(data + 12) + 1;
mux->canvas_height_ = GetLE24(data + 15) + 1;
}
