From db18f29b33a060b3ce0fc7ac7d215aeb3506c0ae Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 17 Sep 2021 21:51:06 +0200
Subject: avcodec/siren: Check index for catergory5

Fixes: out of array access
Fixes: 38603/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSNSIREN_fuzzer-5741847809490944.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/siren.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libavcodec')

diff --git a/libavcodec/siren.c b/libavcodec/siren.c
index 2161b29a2c..7f2b467860 100644
--- a/libavcodec/siren.c
+++ b/libavcodec/siren.c
@@ -648,6 +648,10 @@ static int decode_vector(SirenContext *s, int number_of_regions,
                 }
                 coefs_ptr++;
             }
+            if (i >= FF_ARRAY_ELEMS(noise_category5)) {
+                error = 1;
+                break;
+            }
 
             noise = decoder_standard_deviation[region] * noise_category5[i];
         } else
-- 
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