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avformat/sbgdec: Check for period overflow 

Fixes: signed integer overflow: 4481246996173000000 - -4778576820000000000 cannot be represented in type 'long'
Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-5063670588899328

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a9137110ed)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-09-30 21:18:14 +02:00
parent 559b379cbd
commit 9fd6d62eb5
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1 changed files with 4 additions and 1 deletions
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libavformat/sbgdec.c
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@ -1286,7 +1286,10 @@ static int generate_intervals(void *log, struct sbg_script *s, int sample_rate,
/* SBaGen handles the time before and after the extremal events,
and the corresponding transitions, as if the sequence were cyclic
with a 24-hours period. */
period = s->events[s->nb_events - 1].ts - s->events[0].ts;
period = s->events[s->nb_events - 1].ts - (uint64_t)s->events[0].ts;
if (period < 0)
return AVERROR_INVALIDDATA;
period = (period + (DAY_TS - 1)) / DAY_TS * DAY_TS;
period = FFMAX(period, DAY_TS);