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avcodec/h265_metadata_bsf: Check nb_units before accessing the first in h265_metadata_update_fragment()

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Fixes: null pointer dereference
Fixes: 32113/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_METADATA_fuzzer-4803262287052800

Same as 0c48c332ee

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 497ea04dbd)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2021-03-30 12:36:08 +02:00
parent 7274684a29
commit 54d921f159
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h265_metadata_bsf.c
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@@ -254,7 +254,7 @@ static int h265_metadata_filter(AVBSFContext *bsf, AVPacket *out)
}
// 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 == REMOVE)
ff_cbs_delete_unit(ctx->cbc, au, 0);
} else {