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avformat/iff: check size against INT64_MAX

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Bigger sizes are misinterpreted as negative numbers by the API
Fixes: infinite loop
Fixes: 26611/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4890614975692800

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 f291cd681b1235e150464ad83974d60d6879b492)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-27 21:51:08 +01:00
parent 6a0921a75a
commit 9d6c492479
1 changed files with 3 additions and 0 deletions
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3
libavformat/iff.c
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@ -215,6 +215,9 @@ static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
uint64_t orig_pos = avio_tell(pb);
const char * metadata_tag = NULL;
if (size >= INT64_MAX)
return AVERROR_INVALIDDATA;
switch(tag) {
case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
case MKTAG('D','I','T','I'): metadata_tag = "title"; break;