[FFmpeg-cvslog] avcodec/ylc: Fix shift overflow

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul 22 02:57:12 2017 +0200| [a0edd7f583b8f63340a3c46c04d44f2ed5e0d4e7] | committer: Michael Niedermayer

avcodec/ylc: Fix shift overflow

Fixes: runtime error: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 2698/clusterfuzz-testcase-minimized-4713541443518464

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 03a9e6ff303ad82e75b734edbe4917ca5fd60159)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a0edd7f583b8f63340a3c46c04d44f2ed5e0d4e7
---

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

diff --git a/libavcodec/ylc.c b/libavcodec/ylc.c
index c2263e729a..346960a6cc 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) & ((1U << FFMAX(pl, 1)) - 1);
+        bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
         lens[*pos] = FFMAX(pl, 1);
         xlat[*pos] = s + (pl == 0);
         (*pos)++;