Fixes: out of array read
Fixes: 15261/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LIBVORBIS_fuzzer-5764908467093504
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
vorbis_comment_init(&context->vc) ;
if(p[0] == 0 && p[1] == 30) {
+ int sizesum = 0;
for(i = 0; i < 3; i++){
hsizes[i] = bytestream_get_be16((const uint8_t **)&p);
+ sizesum += 2 + hsizes[i];
+ if (sizesum > avccontext->extradata_size) {
+ av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n");
+ ret = AVERROR_INVALIDDATA;
+ goto error;
+ }
+
headers[i] = p;
p += hsizes[i];
}