ffmpeg | branch: release/3.4 | Michael Niedermayer <mich...@niedermayer.cc> | 
Sat Nov  2 15:52:52 2019 +0100| [978aa2ae50877e8575d6f5061787f836dd2227d4] | 
committer: Michael Niedermayer

avcodec/ralf: use multiply instead of shift to avoid undefined behavior in 
decode_block()

Fixes: left shift of negative value -249
Fixes: 
18566/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5649394561187840

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
(cherry picked from commit 1b7d02642b2096622cee6165fea1301bb9ad54ff)
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=978aa2ae50877e8575d6f5061787f836dd2227d4
---

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

diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c
index 1d881cf7ae..ca8817aa21 100644
--- a/libavcodec/ralf.c
+++ b/libavcodec/ralf.c
@@ -408,7 +408,7 @@ static int decode_block(AVCodecContext *avctx, 
GetBitContext *gb,
     case 4:
         for (i = 0; i < len; i++) {
             t  =   ch1[i] + ctx->bias[1];
-            t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1);
+            t2 = ((ch0[i] + ctx->bias[0]) * 2) | (t & 1);
             dst0[i] = (t2 + t) / 2;
             dst1[i] = (t2 - t) / 2;
         }

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