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avformat/rmdec: check tag_size 

Fixes: signed integer overflow: -2147483648 - 8 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_RM_fuzzer-6598073725353984

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 2cb7ee8a36)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-09-18 15:06:25 +02:00
parent 34e46dc429
commit 82bd617683
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1 changed files with 2 additions and 0 deletions
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libavformat/rmdec.c
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@ -568,6 +568,8 @@ static int rm_read_header(AVFormatContext *s)
}
tag_size = avio_rb32(pb);
if (tag_size < 0)
return AVERROR_INVALIDDATA;
avio_skip(pb, tag_size - 8);
for(;;) {