[FFmpeg-cvslog] avcodec/mlpdec: Fix runtime error: left shift of negative value -22

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat May  6 12:05:17 2017 +0200| [c535436cbeeab89be64e9f3fd652bc736f2f3245] | committer: Michael Niedermayer

avcodec/mlpdec: Fix runtime error: left shift of negative value -22

Fixes: 1355/clusterfuzz-testcase-minimized-6662205472768000

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=c535436cbeeab89be64e9f3fd652bc736f2f3245
---

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

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index c93b058dd7..7cad5d1cad 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -264,7 +264,7 @@ static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
             result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
 
         result  += cp->sign_huff_offset;
-        result <<= quant_step_size;
+        result *= 1 << quant_step_size;
 
         m->sample_buffer[pos + s->blockpos][channel] = result;
     }