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avformat/iff: Check data_size 

Fixes: infinite loop
Fixes: 27834/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5694930919620608

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-11 00:49:23 +01:00
parent adf72718a4
commit 001bc594d8
1 changed files with 1 additions and 1 deletions
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2
libavformat/iff.c
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@ -368,7 +368,7 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
data_pos = avio_tell(pb);
if (data_size < 1)
if (data_size < 1 || data_size >= INT64_MAX)
return AVERROR_INVALIDDATA;
switch (chunk_id) {