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avformat/jacosubdec: Fix timeres to 1/100 units convertion overflow

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Fixes: signed integer overflow: 44444442 * 100 cannot be represented in type 'int'
Fixes: 15117/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5164660531134464

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-07 22:43:42 +02:00
parent 54918b5116
commit 06a90cc783
1 changed files with 5 additions and 4 deletions
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9
libavformat/jacosubdec.c
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@ -107,6 +107,7 @@ static const char *read_ts(JACOsubContext *jacosub, const char *buf,
unsigned hs, ms, ss, fs; // hours, minutes, seconds, frame start
unsigned he, me, se, fe; // hours, minutes, seconds, frame end
int ts_start, ts_end;
int64_t ts_start64, ts_end64;
/* timed format */
if (sscanf(buf, "%u:%u:%u.%u %u:%u:%u.%u %n",
@ -124,10 +125,10 @@ static const char *read_ts(JACOsubContext *jacosub, const char *buf,
return NULL;
shift_and_ret:
ts_start = (ts_start + jacosub->shift) * 100 / jacosub->timeres;
ts_end = (ts_end + jacosub->shift) * 100 / jacosub->timeres;
*start = ts_start;
*duration = ts_end - ts_start;
ts_start64 = (ts_start + jacosub->shift) * 100LL / jacosub->timeres;
ts_end64 = (ts_end + jacosub->shift) * 100LL / jacosub->timeres;
*start = ts_start64;
*duration = ts_end64 - ts_start64;
return buf + len;
}