[FFmpeg-cvslog] avformat/sbgdec: Check ts_int in genrate_intervals

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Sep 18 16:35:41 2022 +0200| [5f529e9147a5c5c8ecf8d5ef0dd569194ce30eed] | committer: Michael Niedermayer

avformat/sbgdec: Check ts_int in genrate_intervals

There is probably a better place to check for this, but better
here than nowhere

Fixes: signed integer overflow: -9223372036824775808 - 86400000000 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-6601162580688896

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=5f529e9147a5c5c8ecf8d5ef0dd569194ce30eed
---

 libavformat/sbgdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
index 4cd12347e7..5edb9664cc 100644
--- a/libavformat/sbgdec.c
+++ b/libavformat/sbgdec.c
@@ -1317,6 +1317,8 @@ static int generate_intervals(void *log, struct sbg_script *s, int sample_rate,
 
     /* Pseudo event before the first one */
     ev0 = s->events[s->nb_events - 1];
+    if (av_sat_sub64(ev0.ts_int, period) != (uint64_t)ev0.ts_int - period)
+        return AVERROR_INVALIDDATA;
     ev0.ts_int   -= period;
     ev0.ts_trans -= period;
     ev0.ts_next  -= period;