[FFmpeg-cvslog] avcodec/wavpack: Fix integer overflow in wv_unpack_stereo()

Michael Niedermayer git at videolan.org
Sun Apr 29 19:04:03 EEST 2018


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr 27 21:44:06 2018 +0200| [da038c07f02dfc10380001c11b3d047eca7cb8c9] | committer: Michael Niedermayer

avcodec/wavpack: Fix integer overflow in wv_unpack_stereo()

Fixes: runtime error: signed integer overflow: 2147483531 + 16384 cannot be represented in type 'int'
Fixes: 6615/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVPACK_fuzzer-5165715515506688

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=da038c07f02dfc10380001c11b3d047eca7cb8c9
---

 libavcodec/wavpack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 0e40b29879..22a2c83a30 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -452,7 +452,7 @@ static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
                 if (type != AV_SAMPLE_FMT_S16P)
                     R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
                 else
-                    R2 = R + ((int)(s->decorr[i].weightB * (unsigned)L2 + 512) >> 10);
+                    R2 = R + (unsigned)((int)(s->decorr[i].weightB * (unsigned)L2 + 512) >> 10);
                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
                 R                        = R2;
                 s->decorr[i].samplesA[0] = R;



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