[FFmpeg-cvslog] avcodec/apedec: fix a integer overflow in long_filter_high_3800()
Michael Niedermayer
git at videolan.org
Thu Apr 14 01:09:32 EEST 2022
ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Mon Mar 28 00:12:17 2022 +0200| [7ea021e7bf974256e5b215e3a328855db9d41b5f] | committer: Michael Niedermayer
avcodec/apedec: fix a integer overflow in long_filter_high_3800()
Fixes: signed integer overflow: -2146549696 - 3923884 cannot be represented in type 'int'
Fixes: 45907/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5992380584558592
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b085b400becb93ccc68d786ab738b1fc50408b89)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7ea021e7bf974256e5b215e3a328855db9d41b5f
---
libavcodec/apedec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 87d704e600..035fa9a434 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -905,7 +905,7 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift, int len
dotprod += delay[j] * (unsigned)coeffs[j];
coeffs[j] += ((delay[j] >> 31) | 1) * sign;
}
- buffer[i] -= dotprod >> shift;
+ buffer[i] -= (unsigned)(dotprod >> shift);
for (j = 0; j < order - 1; j++)
delay[j] = delay[j + 1];
delay[order - 1] = buffer[i];
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