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avformat/asfdec_f: Check sizeX against padding

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Fixes: signed integer overflow: 2147483607 + 64 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_fuzzer-6753897878257664

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 2021-04-23 17:35:20 +02:00
parent bae2e19777
commit f034c2e36a
1 changed files with 1 additions and 1 deletions
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2
libavformat/asfdec_f.c
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@ -415,7 +415,7 @@ static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
tag1 = avio_rl32(pb);
avio_skip(pb, 20);
if (sizeX > 40) {
if (size < sizeX - 40)
if (size < sizeX - 40 || sizeX - 40 > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR_INVALIDDATA;
st->codecpar->extradata_size = ffio_limit(pb, sizeX - 40);
st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size +