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

[Michael Niedermayer]

ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat Apr 27 00:09:02 2024 +0200| [2f0919b26a3dd36958269f130d7f7bd9f4cdbebc] | 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.rheinhardt at outlook.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 5eb05f44503da3fdff82f1fed8ee2706d9841a9a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2f0919b26a3dd36958269f130d7f7bd9f4cdbebc
---

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

diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 2e3ee9dc6e..9bf8a5edaa 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -1914,13 +1914,13 @@ 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);
     }