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avformat/pjsdec: Check duration for overflow

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Fixes: signed integer overflow: -3 - 9223372036854775807 cannot be represented in type 'long'
Fixes: 17828/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5645915116797952

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 1efaac6932)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-04 17:10:38 +02:00
parent 8d483f9849
commit b3d6eabd78
1 changed files with 2 additions and 0 deletions
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libavformat/pjsdec.c
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@ -55,6 +55,8 @@ static int64_t read_ts(char **line, int *duration)
if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {
*line += strcspn(*line, "\"");
*line += !!**line;
if (end < start || end - (uint64_t)start > INT_MAX)
return AV_NOPTS_VALUE;
*duration = end - start;
return start;
}