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avformat/ape: Check frames size 

Fixes: signed integer overflow: 9223372036854775806 + 3 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_APE_fuzzer-6389264140599296

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-09-17 21:19:53 +02:00
parent 1b47190c94
commit d0349c9929
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1 changed files with 2 additions and 0 deletions
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libavformat/ape.c
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@ -298,6 +298,8 @@ static int ape_read_header(AVFormatContext * s)
ape->frames[i].pos -= ape->frames[i].skip;
ape->frames[i].size += ape->frames[i].skip;
}
if (ape->frames[i].size > INT_MAX - 3)
return AVERROR_INVALIDDATA;
ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
}
if (ape->fileversion < 3810) {