From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 6 May 2017 13:17:29 +0000 (+0200)
Subject: avcodec/mimic: Fix runtime error: left shift of negative value -1
X-Git-Tag: android-x86-7.1-r1~505
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=fc2c420b82939a8f30838a6aa08bfd936099d3ce;p=android-x86%2Fexternal-ffmpeg.git

avcodec/mimic: Fix runtime error: left shift of negative value -1

Fixes: 1365/clusterfuzz-testcase-minimized-5624158450876416

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---

diff --git a/libavcodec/mimic.c b/libavcodec/mimic.c
index 0cc30ab0ed..61ce1ce584 100644
--- a/libavcodec/mimic.c
+++ b/libavcodec/mimic.c
@@ -262,7 +262,7 @@ static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
 
         coeff = vlcdec_lookup[num_bits][value];
         if (pos < 3)
-            coeff <<= 4;
+            coeff *= 16;
         else /* TODO Use >> 10 instead of / 1001 */
             coeff = (coeff * qscale) / 1001;