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avcodec/vp3: Check version in all cases when VP4 code is not built

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Fixes: out of array read
Fixes: 40284/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP3_fuzzer-4599568176644096

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-11-30 19:46:17 +01:00
parent db27a35012
commit 96caa01f13
1 changed files with 8 additions and 1 deletions
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9
libavcodec/vp3.c
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@ -2685,7 +2685,14 @@ static int vp3_decode_frame(AVCodecContext *avctx,
skip_bits(&gb, 4); /* width code */
skip_bits(&gb, 4); /* height code */
if (s->version) {
s->version = get_bits(&gb, 5);
int version = get_bits(&gb, 5);
#if !CONFIG_VP4_DECODER
if (version >= 2) {
av_log(avctx, AV_LOG_ERROR, "This build does not support decoding VP4.\n");
return AVERROR_DECODER_NOT_FOUND;
}
#endif
s->version = version;
if (avctx->frame_number == 0)
av_log(s->avctx, AV_LOG_DEBUG,
"VP version: %d\n", s->version);