I was not able to reproduce this, this fix is based on just the fuzzer log.
Fixes: 4959/clusterfuzz-testcase-minimized-6035350934781952

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/aacdec_fixed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index f96999efb4..5c3613e06c 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -417,7 +417,7 @@ static void apply_independent_coupling_fixed(AACContext *ac,
     int i, c, shift, round, tmp;
     const int gain = cce->coup.gain[index][0];
     const int *src = cce->ch[0].ret;
-    int *dest = target->ret;
+    unsigned int *dest = target->ret;
     const int len = 1024 << (ac->oc[1].m4ac.sbr == 1);
 
     c = cce_scale_fixed[gain & 7];
-- 
2.16.2

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