[FFmpeg-cvslog] avcodec/h265_metadata_bsf: Check nb_units before accessing the first in h265_metadata_update_fragment()
Michael Niedermayer
git at videolan.org
Thu Apr 1 11:10:48 EEST 2021
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Mar 30 12:36:08 2021 +0200| [497ea04dbda78d4eb9cffd208737b676f838725c] | committer: Michael Niedermayer
avcodec/h265_metadata_bsf: Check nb_units before accessing the first in h265_metadata_update_fragment()
Fixes: null pointer dereference
Fixes: 32113/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_METADATA_fuzzer-4803262287052800
Same as 0c48c332eeb2866d9353125f701e099c48889463
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=497ea04dbda78d4eb9cffd208737b676f838725c
---
libavcodec/h265_metadata_bsf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/h265_metadata_bsf.c b/libavcodec/h265_metadata_bsf.c
index 59325c0471..d841839762 100644
--- a/libavcodec/h265_metadata_bsf.c
+++ b/libavcodec/h265_metadata_bsf.c
@@ -335,7 +335,7 @@ static int h265_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
int err, i;
// If an AUD is present, it must be the first NAL unit.
- if (au->units[0].type == HEVC_NAL_AUD) {
+ if (au->nb_units && au->units[0].type == HEVC_NAL_AUD) {
if (ctx->aud == BSF_ELEMENT_REMOVE)
ff_cbs_delete_unit(au, 0);
} else {
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