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avformat/subtitles: Check nb_subs in ff_subtitles_queue_finalize()

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Fixes: null pointer dereference
Fixes: 17828/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5645915116797952
Fixes: Ticket8147

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 81b53913bb)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-04 17:10:38 +02:00
parent 44b48d6acb
commit 292c492271
1 changed files with 3 additions and 0 deletions
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3
libavformat/subtitles.c
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@ -194,6 +194,9 @@ void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
{ {
int i; int i;
if (!q->nb_subs)
return;
qsort(q->subs, q->nb_subs, sizeof(*q->subs), qsort(q->subs, q->nb_subs, sizeof(*q->subs),
q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos
: cmp_pkt_sub_pos_ts); : cmp_pkt_sub_pos_ts);