[FFmpeg-cvslog] avcodec/xvididct: Fix integer overflow in idct_row()
Michael Niedermayer
git at videolan.org
Sat Sep 23 00:54:20 EEST 2023
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep 8 00:13:11 2023 +0200| [b12444fe72173ab52b6479708cfd12cb889ca300] | committer: Michael Niedermayer
avcodec/xvididct: Fix integer overflow in idct_row()
Fixes: signed integer overflow: 1871429831 + 343006811 cannot be represented in type 'int'
Fixes: 61784/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AIC_fuzzer-5372151001120768
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b12444fe72173ab52b6479708cfd12cb889ca300
---
libavcodec/xvididct.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/xvididct.c b/libavcodec/xvididct.c
index 43ea927437..dcea32210a 100644
--- a/libavcodec/xvididct.c
+++ b/libavcodec/xvididct.c
@@ -114,7 +114,7 @@ static int idct_row(short *in, const int *const tab, int rnd)
in[5] = a1;
in[6] = a1;
} else {
- const int k = c4 * in[0] + rnd;
+ const unsigned int k = c4 * in[0] + rnd;
const unsigned int a0 = k + c2 * in[2] + c4 * in[4] + c6 * in[6];
const unsigned int a1 = k + c6 * in[2] - c4 * in[4] - c2 * in[6];
const unsigned int a2 = k - c6 * in[2] - c4 * in[4] + c2 * in[6];
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