[FFmpeg-cvslog] avcodec/aacdec_fixed: Fix undefined integer overflow in apply_independent_coupling_fixed()

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 14 16:41:49 2018 +0200| [516f8dbc58a2777b23065e83157f8462d00600dd] | committer: Michael Niedermayer

avcodec/aacdec_fixed: Fix undefined integer overflow in apply_independent_coupling_fixed()

Fixes: signed integer overflow: 1195517 * 2048 cannot be represented in type 'int'
Fixes: 8636/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-4695836326887424

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 8bd514d9343746566b123275f8b6d0e9c11ec2b0)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=516f8dbc58a2777b23065e83157f8462d00600dd
---

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

diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index e4152bea6a..c92f873335 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -434,7 +434,7 @@ static void apply_independent_coupling_fixed(AACContext *ac,
     else {
       for (i = 0; i < len; i++) {
           tmp = (int)(((int64_t)src[i] * c + (int64_t)0x1000000000) >> 37);
-          dest[i] += tmp * (1 << shift);
+          dest[i] += tmp * (1U << shift);
       }
     }
 }