[FFmpeg-devel] [PATCH 2/2] avformat/subtitles: Check for NOPTS in ff_subtitles_queue_finalize()

[Michael Niedermayer]

Fixes; signed integer overflow: 1 - -9223372036854775808 cannot be represented in type 'long'
Fixes: 23490/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5133490093031424

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

diff --git a/libavformat/subtitles.c b/libavformat/subtitles.c
index ad7f68938e..ccab80391f 100644
--- a/libavformat/subtitles.c
+++ b/libavformat/subtitles.c
@@ -202,7 +202,7 @@ void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
           q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos
                                      : cmp_pkt_sub_pos_ts);
     for (i = 0; i < q->nb_subs; i++)
-        if (q->subs[i].duration < 0 && i < q->nb_subs - 1)
+        if (q->subs[i].duration < 0 && i < q->nb_subs - 1 && q->subs[i].pts != AV_NOPTS_VALUE)
             q->subs[i].duration = q->subs[i + 1].pts - q->subs[i].pts;
 
     if (!q->keep_duplicates)
-- 
2.17.1