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avformat/mvdec: Fix DoS due to lack of eof check 

Fixes: loop.mv

Found-by: Xiaohei and Wangchu from Alibaba Security Team
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4f05e2e2dc)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-25 01:15:30 +02:00
parent 2ac9bc3497
commit 0ca5c57d9d
1 changed files with 2 additions and 0 deletions
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2
libavformat/mvdec.c
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@ -327,6 +327,8 @@ static int mv_read_header(AVFormatContext *avctx)
uint32_t pos = avio_rb32(pb);
uint32_t asize = avio_rb32(pb);
uint32_t vsize = avio_rb32(pb);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
avio_skip(pb, 8);
av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);