[FFmpeg-devel] [PATCH 4/4] avformat/aqtitledec: Skip unrepresentable durations

[Michael Niedermayer]

Fixes: signed integer overflow: -5 - 9223372036854775807 cannot be represented in type 'long'
Fixes: 45665/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-475618463934054

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/aqtitledec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/aqtitledec.c b/libavformat/aqtitledec.c
index a37c9bbeaf..6c14b23862 100644
--- a/libavformat/aqtitledec.c
+++ b/libavformat/aqtitledec.c
@@ -74,7 +74,8 @@ static int aqt_read_header(AVFormatContext *s)
             new_event = 1;
             pos = avio_tell(s->pb);
             if (sub) {
-                sub->duration = frame - sub->pts;
+                if (frame >= sub->pts && (uint64_t)frame - sub->pts < INT64_MAX)
+                    sub->duration = frame - sub->pts;
                 sub = NULL;
             }
         } else if (*line) {
-- 
2.17.1