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asfdec_o: check for too small size in asf_read_unknown 

This fixes infinite loops due to seeking back.

Reviewed-by: Alexandra Hájková <alexandra.khirnova@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-01-06 19:21:49 +01:00
parent 0e32153e9c
commit c29e87ad55
1 changed files with 6 additions and 1 deletions
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7
libavformat/asfdec_o.c
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@ -190,8 +190,13 @@ static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
if ((ret = detect_unknown_subobject(s, asf->unknown_offset,
asf->unknown_size)) < 0)
return ret;
} else
} else {
if (size < 24) {
av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
return AVERROR_INVALIDDATA;
}
avio_skip(pb, size - 24);
}
return 0;
}