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avformat/iff: Check size before skip

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Fixes: Infinite loop
Fixes: 27292/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5731168991051776

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 8b50e8bc29)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2020-11-14 20:59:01 +01:00
parent aa11e4c712
commit e0c1af04b2
1 changed files with 3 additions and 0 deletions
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3
libavformat/iff.c
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@@ -259,6 +259,9 @@ static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
uint64_t size = avio_rb64(pb);
uint64_t orig_pos = avio_tell(pb);
if (size >= INT64_MAX)
return AVERROR_INVALIDDATA;
switch(tag) {
case MKTAG('A','B','S','S'):
if (size < 8)