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avcodec/exr: Avoid signed overflow in displayWindow 

The inputs are unused except for this computation so wraparound
does not give an attacker any extra values as they are already fully
controlled

Fixes: signed integer overflow: 0 - -2147483648 cannot be represented in type 'int'
Fixes: 45820/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5766159019933696

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-03-21 21:03:13 +01:00
parent 7f1279684e
commit 1291568c98
1 changed files with 2 additions and 2 deletions
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4
libavcodec/exr.c
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@ -1833,8 +1833,8 @@ static int decode_header(EXRContext *s, AVFrame *frame)
dx = bytestream2_get_le32(gb);
dy = bytestream2_get_le32(gb);
s->w = dx - sx + 1;
s->h = dy - sy + 1;
s->w = (unsigned)dx - sx + 1;
s->h = (unsigned)dy - sy + 1;
continue;
} else if ((var_size = check_header_variable(s, "lineOrder",