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avformat/dxa: check bpc

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Fixes: integer overflow: -2147483648 - 1 cannot be represented in type 'int'
Fixes: 373971762/clusterfuzz-testcase-minimized-ffmpeg_dem_DXA_fuzzer-4880491112103936

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
2024-10-19 01:15:53 +02:00
parent aeec39f3c1
commit 7e020f2141
1 changed files with 2 additions and 0 deletions
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libavformat/dxa.c
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@@ -120,6 +120,8 @@ static int dxa_read_header(AVFormatContext *s)
avio_skip(pb, fsize);
}
c->bpc = (fsize + (int64_t)c->frames - 1) / c->frames;
if (c->bpc < 0)
return AVERROR_INVALIDDATA;
if(ast->codecpar->block_align) {
if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
return AVERROR_INVALIDDATA;