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avformat/dsfdec: Check block_align more completely 

Fixes: infinite loop
Fixes: 26865/clusterfuzz-testcase-minimized-ffmpeg_dem_DSF_fuzzer-5649473830912000

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 65b8974d54)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-05 21:22:13 +01:00
parent fe64c72c5a
commit a643e2e9c1
1 changed files with 2 additions and 2 deletions
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4
libavformat/dsfdec.c
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@ -124,8 +124,8 @@ static int dsf_read_header(AVFormatContext *s)
dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->channels;
st->codecpar->block_align = avio_rl32(pb);
if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {
avpriv_request_sample(s, "block_align overflow");
if (st->codecpar->block_align > INT_MAX / st->codecpar->channels || st->codecpar->block_align <= 0) {
avpriv_request_sample(s, "block_align invalid");
return AVERROR_INVALIDDATA;
}
st->codecpar->block_align *= st->codecpar->channels;