[FFmpeg-cvslog] avcodec/mlpdsp: Fix signed integer overflow, 2nd try

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Mon Nov 20 18:45:45 2017 +0100| [6011422a5415ee53ba195ffaa8d60f44e06cdbdf] | committer: Michael Niedermayer

avcodec/mlpdsp: Fix signed integer overflow, 2nd try

The outputted bits should match what is used in the lossless check

Fixes: runtime error: signed integer overflow: -538697856 * 256 cannot be represented in type 'int'
Fixes: 4326/clusterfuzz-testcase-minimized-5689449645080576

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 97c00edaa043043c29d985653e7e1687b56dfa23)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6011422a5415ee53ba195ffaa8d60f44e06cdbdf
---

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

diff --git a/libavcodec/mlpdsp.c b/libavcodec/mlpdsp.c
index 4e3a16c781..32a4503b64 100644
--- a/libavcodec/mlpdsp.c
+++ b/libavcodec/mlpdsp.c
@@ -117,7 +117,7 @@ int32_t ff_mlp_pack_output(int32_t lossless_check_data,
                           (1U << output_shift[mat_ch]);
             lossless_check_data ^= (sample & 0xffffff) << mat_ch;
             if (is32)
-                *data_32++ = sample * 256;
+                *data_32++ = sample * 256U;
             else
                 *data_16++ = sample >> 8;
         }