[FFmpeg-cvslog] avcodec/takdec: Fix integer overflow in decode_lpc()
Michael Niedermayer
git at videolan.org
Sun Sep 24 22:56:49 EEST 2017
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep 22 20:45:27 2017 +0200| [5d31f03a0264cac24434c8108daef4ccba6d28f9] | committer: Michael Niedermayer
avcodec/takdec: Fix integer overflow in decode_lpc()
Fixes: runtime error: signed integer overflow: 16748560 + 2143729712 cannot be represented in type 'int'
Fixes: 3202/clusterfuzz-testcase-minimized-4988291642294272
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=5d31f03a0264cac24434c8108daef4ccba6d28f9
---
libavcodec/takdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index 9c253c1e8e..0439a3ac9b 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -206,7 +206,7 @@ static void decode_lpc(int32_t *coeffs, int mode, int length)
unsigned a1 = *coeffs++;
for (i = 0; i < length - 1 >> 1; i++) {
*coeffs += a1;
- coeffs[1] += *coeffs;
+ coeffs[1] += (unsigned)*coeffs;
a1 = coeffs[1];
coeffs += 2;
}
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