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avformat/smacker: Check for too small pts_inc

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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: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_SMACKER_fuzzer-6705429132476416

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 f54aab94a363489edcda492637d6e7409cc5446b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-17 22:14:03 +01:00
parent 32c6304cf0
commit bbb5494801
1 changed files with 2 additions and 2 deletions
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4
libavformat/smacker.c
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@ -104,8 +104,8 @@ static int smacker_read_header(AVFormatContext *s)
height = avio_rl32(pb); height = avio_rl32(pb);
smk->frames = avio_rl32(pb); smk->frames = avio_rl32(pb);
pts_inc = avio_rl32(pb); pts_inc = avio_rl32(pb);
if (pts_inc > INT_MAX / 100) { if (pts_inc > INT_MAX / 100 || pts_inc == INT_MIN) {
av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", pts_inc); av_log(s, AV_LOG_ERROR, "pts_inc %d is invalid\n", pts_inc);
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }