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avcodec/hevcdec: Check s->ref in the md5 path similar to hwaccel

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This is somewhat redundant with the is_decoded check. Maybe
there is a nicer solution

Fixes: Null pointer dereference
Fixes: 49584/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5297367351427072

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3b51e19922)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-08-14 23:39:56 +02:00
parent a90844d443
commit d246af82c2
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1 changed files with 1 additions and 1 deletions
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libavcodec/hevcdec.c
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@ -3499,7 +3499,7 @@ static int hevc_decode_frame(AVCodecContext *avctx, void *data, int *got_output,
}
} else {
/* verify the SEI checksum */
if (avctx->err_recognition & AV_EF_CRCCHECK && s->is_decoded &&
if (avctx->err_recognition & AV_EF_CRCCHECK && s->ref && s->is_decoded &&
s->sei.picture_hash.is_md5) {
ret = verify_md5(s, s->ref->frame);
if (ret < 0 && avctx->err_recognition & AV_EF_EXPLODE) {