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avformat/tedcaptionsdec: Check for overflow in parse_int()

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Fixes: signed integer overflow: 1111111111111111111 * 10 cannot be represented in type 'long'
Fixes: 26892/clusterfuzz-testcase-minimized-ffmpeg_dem_TEDCAPTIONS_fuzzer-5756045055754240

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 b0f8586ca9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-07 21:11:32 +01:00
parent 220eaaf6b6
commit 9e1fede231
1 changed files with 2 additions and 0 deletions
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libavformat/tedcaptionsdec.c
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@ -181,6 +181,8 @@ static int parse_int(AVIOContext *pb, int *cur_byte, int64_t *result)
if ((unsigned)*cur_byte - '0' > 9)
return AVERROR_INVALIDDATA;
while (BETWEEN(*cur_byte, '0', '9')) {
if (val > INT_MAX/10 - (*cur_byte - '0'))
return AVERROR_INVALIDDATA;
val = val * 10 + (*cur_byte - '0');
next_byte(pb, cur_byte);
}