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

Michael Niedermayer git at videolan.org
Sun Jun 25 02:14:05 EEST 2017


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun 25 00:13:53 2017 +0200| [73ea2a028e12a7d779834f78dc496c8c4b08361f] | committer: Michael Niedermayer

avcodec/wavpack: Fix integer overflow in wv_unpack_stereo()

Fixes: runtime error: signed integer overflow: 2080374785 + 2080374784 cannot be represented in type 'int'
Fixes: 2351/clusterfuzz-testcase-minimized-5359403240783872

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=73ea2a028e12a7d779834f78dc496c8c4b08361f
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index e127c272a9..bc4b030425 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -480,7 +480,7 @@ static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
         }
 
         if (type == AV_SAMPLE_FMT_S16P) {
-            if (FFABS(L) + FFABS(R) > (1<<19)) {
+            if (FFABS(L) + (unsigned)FFABS(R) > (1<<19)) {
                 av_log(s->avctx, AV_LOG_ERROR, "sample %d %d too large\n", L, R);
                 return AVERROR_INVALIDDATA;
             }



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