[FFmpeg-devel] [PATCH 5/5] avcodec/h266_metadata_bsf: Check if there are CodedBitstreamFragment units

[Michael Niedermayer]

Fixes: NULL pointer dereference
Fixes: 60269/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_METADATA_fuzzer-5215449416335360

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/h266_metadata_bsf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h266_metadata_bsf.c b/libavcodec/h266_metadata_bsf.c
index c0dbf8ef96..1f0f875cfe 100644
--- a/libavcodec/h266_metadata_bsf.c
+++ b/libavcodec/h266_metadata_bsf.c
@@ -43,7 +43,7 @@ static int h266_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
     int err, i;
 
     // If an AUD is present, it must be the first NAL unit.
-    if (pu->units[0].type == VVC_AUD_NUT) {
+    if (pu->nb_units && pu->units[0].type == VVC_AUD_NUT) {
         if (ctx->aud == BSF_ELEMENT_REMOVE)
             ff_cbs_delete_unit(pu, 0);
     } else if ( pkt && ctx->aud == BSF_ELEMENT_INSERT) {
-- 
2.17.1