[FFmpeg-cvslog] avcodec/ilbcdec: Fix integer overflow in construct_vector()
Michael Niedermayer
git at videolan.org
Mon Jan 28 02:24:15 EET 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Jan 15 00:02:25 2019 +0100| [c95d0fb23917c35886f3b62daa05af20d2700a1e] | committer: Michael Niedermayer
avcodec/ilbcdec: Fix integer overflow in construct_vector()
webrtc contains explicit code to ignore the undefined behavior (RTC_NO_SANITIZE / OverflowingAddS32S32ToS32())
Probably fixes: Integer overflow (unreproducable here)
Probably fixes: 12215/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ILBC_fuzzer-5767142427852800
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=c95d0fb23917c35886f3b62daa05af20d2700a1e
---
libavcodec/ilbcdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/ilbcdec.c b/libavcodec/ilbcdec.c
index 50012c0231..643547f4ab 100644
--- a/libavcodec/ilbcdec.c
+++ b/libavcodec/ilbcdec.c
@@ -745,7 +745,7 @@ static void construct_vector (
for (j = 0; j < veclen; j++) {
a32 = SPL_MUL_16_16(*gainPtr++, cbvec0[j]);
a32 += SPL_MUL_16_16(*gainPtr++, cbvec1[j]);
- a32 += SPL_MUL_16_16(*gainPtr, cbvec2[j]);
+ a32 += (unsigned)SPL_MUL_16_16(*gainPtr, cbvec2[j]);
gainPtr -= 2;
decvector[j] = (a32 + 8192) >> 14;
}
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