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avformat/sbgdec: Check for t0 overflow in expand_tseq() 

Fixes: signed integer overflow: 4611686025627387904 + 4611686025627387904 cannot be represented in type 'long'
Fixes: 35489/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-4862678601433088

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>
This commit is contained in:
Michael Niedermayer 2021-09-15 22:00:44 +02:00
parent e93c998602
commit f624c92d4c
1 changed files with 3 additions and 0 deletions
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3
libavformat/sbgdec.c
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@ -965,6 +965,9 @@ static int expand_tseq(void *log, struct sbg_script *s, int *nb_ev_max,
tseq->name_len, tseq->name);
return AVERROR(EINVAL);
}
if (t0 + (uint64_t)tseq->ts.t != av_sat_add64(t0, tseq->ts.t))
return AVERROR(EINVAL);
t0 += tseq->ts.t;
for (i = 0; i < s->nb_def; i++) {
if (s->def[i].name_len == tseq->name_len &&