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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-03-21 21:03:13 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-04-06 20:27:35 +0200 |
| commit | 15006f48cd75fb7c93c06dde50b76ea1309cce00 (patch) | |
| tree | 8956d85e93506b270c7f6fea3747bea172239952 | |
| parent | 977cfb719745dab296d748b6304f349b01ce6a08 (diff) | |
| download | ffmpeg-15006f48cd75fb7c93c06dde50b76ea1309cce00.tar.gz | |
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>
(cherry picked from commit 1291568c9834c02413ab5d87762308f15b4ae9c6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/exr.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/exr.c b/libavcodec/exr.c index 49ba7fd6de..b6bf87ab81 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -1829,8 +1829,8 @@ 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", |