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avcodec/hevcdec: Check ref frame

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Fixes: NULL pointer dereferences
Fixes: 68197/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-6382538823106560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5eb05f4450)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-04-27 00:09:02 +02:00
parent bff75516c7
commit ea24864562
1 changed files with 2 additions and 2 deletions
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4
libavcodec/hevcdec.c
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@@ -1895,13 +1895,13 @@ 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 || !ref0->frame->data[0])
if (!ref0 || !ref0->frame)
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 || !ref1->frame->data[0])
if (!ref1 || !ref1->frame)
return;
hevc_await_progress(s, ref1, &current_mv.mv[1], y0, nPbH);
}