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avformat/mccdec: Fix overflows in num/den

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Fixes: signed integer overflow: 6365816 * 1000 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_MCC_fuzzer-6737934184218624

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 ff05326081922059314b8927cf9bbc9c7e73458f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-04-24 16:37:34 +02:00
parent ce60ee3e5c
commit 612472c647
1 changed files with 1 additions and 2 deletions
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3
libavformat/mccdec.c
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@ -127,8 +127,7 @@ static int mcc_read_header(AVFormatContext *s)
num = strtol(rate_str, &df, 10); num = strtol(rate_str, &df, 10);
den = 1; den = 1;
if (df && !av_strncasecmp(df, "DF", 2)) { if (df && !av_strncasecmp(df, "DF", 2)) {
num *= 1000; av_reduce(&num, &den, num * 1000LL, 1001, INT_MAX);
den = 1001;
} }
} }