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avformat/aiffdec: Check size before subtraction in get_aiff_header()

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Fixes: Infinite loop
Fixes: 27235/clusterfuzz-testcase-minimized-ffmpeg_dem_AIFF_fuzzer-5761398380167168

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 8af299acde)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-10 23:01:12 +01:00
parent 6ed98dfd14
commit 502ca11d69
1 changed files with 2 additions and 0 deletions
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libavformat/aiffdec.c
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@ -119,6 +119,8 @@ static int get_aiff_header(AVFormatContext *s, int size,
else
sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
par->sample_rate = sample_rate;
if (size < 18)
return AVERROR_INVALIDDATA;
size -= 18;
/* get codec id for AIFF-C */