From b5228e44c7f3a5eba537c8a39a45cfbf2961a28d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 21 May 2017 16:53:55 +0200
Subject: [PATCH] avcodec/aacdec_fixed: Fix runtime error: shift exponent 34 is
too large for 32-bit type 'int'
Fixes: 1721/clusterfuzz-testcase-minimized-4719352135811072
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/aacdec_fixed.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index b416cf1d25c..7b5e40e4844 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -207,7 +207,11 @@ static void noise_scale(int *coefs, int scale, int band_energy, int len)
c /= band_energy;
s = 21 + nlz - (s >> 2);
- if (s > 0) {
+ if (s > 31) {
+ for (i=0; i<len; i++) {
+ coefs[i] = 0;
+ }
+ } else if (s > 0) {
round = 1 << (s-1);
for (i=0; i<len; i++) {
out = (int)(((int64_t)coefs[i] * c) >> 32);
--
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