From ec9af84dc5445d272092e91452fa67d796729e1f Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 14 Aug 2022 23:39:56 +0200 Subject: avcodec/hevcdec: Check s->ref in the md5 path similar to hwaccel 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 (cherry picked from commit 3b51e1992289383aa9f083c88e153e34b6412c89) Signed-off-by: Michael Niedermayer --- libavcodec/hevcdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c index 97f9def809..1960c6a202 100644 --- a/libavcodec/hevcdec.c +++ b/libavcodec/hevcdec.c @@ -3221,7 +3221,7 @@ 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) { -- cgit v1.2.1