[FFmpeg-cvslog] avcodec/wmaprodec: Fixes integer overflow with 32bit samples

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Wed Nov 20 20:34:55 2019 +0100| [300739d5893d97436ec4e17048ca28b7c9db2d0d] | committer: Michael Niedermayer

avcodec/wmaprodec: Fixes integer overflow with 32bit samples

Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 18860/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAPRO_fuzzer-5755223125786624

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 a9cc69c0d59057ea172a107e0308fdf5fd8fc04e)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=300739d5893d97436ec4e17048ca28b7c9db2d0d
---

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

diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 3aa3e6350a..b3f4c8f59a 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -471,7 +471,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
         ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
                      1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
-                     / (1 << (s->bits_per_sample - 1)));
+                     / (1ll << (s->bits_per_sample - 1)));
 
     /** init MDCT windows: simple sine window */
     for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {