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avformat/jacosubdec: Check for min in t overflow in get_shift()

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Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 34651/clusterfuzz-testcase-minimized-ffmpeg_dem_JACOSUB_fuzzer-5157941012463616

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 989febfbd0c986e9e3e0f269a6b22778bf79147b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-06-03 22:26:41 +02:00
parent 26083824d7
commit d482bf35eb
1 changed files with 3 additions and 0 deletions
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libavformat/jacosubdec.c
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@ -141,6 +141,9 @@ static int get_shift(int timeres, const char *buf)
int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d); int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d);
#undef SSEP #undef SSEP
if (a == INT_MIN)
return 0;
if (*buf == '-' || a < 0) { if (*buf == '-' || a < 0) {
sign = -1; sign = -1;
a = FFABS(a); a = FFABS(a);