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avformat/samidec: Sanity check pts 

Fixes: signed integer overflow: 0 - -9223372036854775808 cannot be represented in type 'long'
Fixes: 29743/clusterfuzz-testcase-minimized-ffmpeg_dem_SAMI_fuzzer-5499256859394048

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 2014b01352)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-31 17:00:38 +01:00
parent a5f24927a7
commit fcbcc75059
1 changed files with 5 additions and 0 deletions
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5
libavformat/samidec.c
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@ -95,6 +95,11 @@ static int sami_read_header(AVFormatContext *s)
const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
sub->pos = pos;
sub->pts = p ? strtol(p, NULL, 10) : 0;
if (sub->pts <= INT64_MIN/2 || sub->pts >= INT64_MAX/2) {
res = AVERROR_PATCHWELCOME;
goto end;
}
sub->duration = -1;
}
}