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avcodec/hevcdec: Avoid null pointer dereferences in MC

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Fixes: runtime error: pointer index expression with base 0x000000000000 overflowed to 0xfffffffffffffff8
Fixes: 58440/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5956015530311680

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 a0f4d4e650)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-05-25 23:40:18 +02:00
parent b5f4fc9aa9
commit 3b811d871e
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1 changed files with 2 additions and 2 deletions
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libavcodec/hevc.c
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@ -1749,13 +1749,13 @@ static void hls_prediction_unit(HEVCContext *s, int x0, int y0,
if (current_mv.pred_flag & PF_L0) {
ref0 = refPicList[0].ref[current_mv.ref_idx[0]];
if (!ref0)
if (!ref0 || !ref0->frame->data[0])
return;
hevc_await_progress(s, ref0, &current_mv.mv[0], y0, nPbH);
}
if (current_mv.pred_flag & PF_L1) {
ref1 = refPicList[1].ref[current_mv.ref_idx[1]];
if (!ref1)
if (!ref1 || !ref1->frame->data[0])
return;
hevc_await_progress(s, ref1, &current_mv.mv[1], y0, nPbH);
}