[FFmpeg-cvslog] avcodec/ralf: Fix undefined pointer in decode_channel()

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug  4 17:25:55 2019 +0200| [5764b92f82c25a7b5724e8b47cd9746ca17f1b14] | committer: Michael Niedermayer

avcodec/ralf: Fix undefined pointer in decode_channel()

Fixes: 16203/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5086088934195200

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 3c06ba171697b665ef4b2b47fe0008199b3eff86)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5764b92f82c25a7b5724e8b47cd9746ca17f1b14
---

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

diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c
index 0d6b57d652..619fd7126a 100644
--- a/libavcodec/ralf.c
+++ b/libavcodec/ralf.c
@@ -286,7 +286,7 @@ static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch,
             add_bits--;
         range    = 10;
         range2   = 21;
-        code_vlc = set->long_codes + code_params - 15;
+        code_vlc = set->long_codes + (code_params - 15);
     } else {
         add_bits = 0;
         range    = 6;