[FFmpeg-cvslog] avcodec/ylc: Fix vlc of 31 bits

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul  8 22:51:57 2017 +0200| [51f0580c5f4315cae4788e0fbfb7c26fa191afd3] | committer: Michael Niedermayer

avcodec/ylc: Fix vlc of 31 bits

Fixes: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 2515/clusterfuzz-testcase-minimized-6197200012967936

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit fe9242204d33db070b8a9d907d93c9ead8a6f3ee)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=51f0580c5f4315cae4788e0fbfb7c26fa191afd3
---

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

diff --git a/libavcodec/ylc.c b/libavcodec/ylc.c
index 1af880f4d4..c2263e729a 100644
--- a/libavcodec/ylc.c
+++ b/libavcodec/ylc.c
@@ -68,7 +68,7 @@ static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
 
     s = nodes[node].sym;
     if (s != -1) {
-        bits[*pos] = (~pfx) & ((1 << FFMAX(pl, 1)) - 1);
+        bits[*pos] = (~pfx) & ((1U << FFMAX(pl, 1)) - 1);
         lens[*pos] = FFMAX(pl, 1);
         xlat[*pos] = s + (pl == 0);
         (*pos)++;