[FFmpeg-cvslog] avcodec/dca_xll: Fix runtime error: signed integer overflow: 1762028192 + 698372290 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Mar 11 03:38:01 2017 +0100| [f4c2302ee24d8a6a31226acca48fe9caed597a8c] | committer: Michael Niedermayer

avcodec/dca_xll: Fix runtime error: signed integer overflow: 1762028192 + 698372290 cannot be represented in type 'int'

Fixes: 762/clusterfuzz-testcase-5927683747741696

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f4c2302ee24d8a6a31226acca48fe9caed597a8c
---

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

diff --git a/libavcodec/dca_xll.c b/libavcodec/dca_xll.c
index 6cebda3..b7331e0 100644
--- a/libavcodec/dca_xll.c
+++ b/libavcodec/dca_xll.c
@@ -658,7 +658,7 @@ static void chs_filter_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band)
             // Inverse fixed coefficient prediction
             for (j = 0; j < b->fixed_pred_order[i]; j++)
                 for (k = 1; k < nsamples; k++)
-                    buf[k] += buf[k - 1];
+                    buf[k] += (unsigned)buf[k - 1];
         }
     }