[FFmpeg-cvslog] avcodec/alsdec: Fix integer overflow with quant_cof

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec 26 18:55:08 2020 +0100| [7ce40dde03ea56684f2cb6b40991a90bc38c3ad9] | committer: Michael Niedermayer

avcodec/alsdec: Fix integer overflow with quant_cof

Fixes: signed integer overflow: -210824 * 16384 cannot be represented in type 'int'
Fixes: 28670/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5682310846480384

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=7ce40dde03ea56684f2cb6b40991a90bc38c3ad9
---

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

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index c318ad088e..b3c444c54f 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -762,7 +762,7 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
             }
 
             for (k = 2; k < opt_order; k++)
-                quant_cof[k] = (quant_cof[k] * (1 << 14)) + (add_base << 13);
+                quant_cof[k] = (quant_cof[k] * (1U << 14)) + (add_base << 13);
         }
     }