[FFmpeg-cvslog] avcodec/hevcdec: Check ref frame

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <mich...@niedermayer.cc> | 
Sat Apr 27 00:09:02 2024 +0200| [a17acf84d86a98b4875e26d353364b63a4ba3a21] | 
committer: Michael Niedermayer

avcodec/hevcdec: Check ref frame

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.rheinha...@outlook.com>
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
(cherry picked from commit 5eb05f44503da3fdff82f1fed8ee2706d9841a9a)
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a17acf84d86a98b4875e26d353364b63a4ba3a21
---

 libavcodec/hevc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index d1a99013be..5a6aa733da 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -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 || !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);
     }

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