From 807c4c787597407038750dcae6935134ed0f9015 Mon Sep 17 00:00:00 2001
From: Kenan Gillet <kenan.gillet@gmail.com>
Date: Wed, 15 Apr 2009 19:28:28 +0000
Subject: [PATCH] Fix possibly harmful outbound addressing. Patch by Kenan
 Gillet.

Originally committed as revision 18528 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/celp_filters.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c
index a48368f242..ef1a578f44 100644
--- a/libavcodec/celp_filters.c
+++ b/libavcodec/celp_filters.c
@@ -61,15 +61,14 @@ int ff_celp_lp_synthesis_filter(
 {
     int i,n;
 
-    // These two lines are to avoid a -1 subtraction in the main loop
+    // This line is to avoid a +1 subtraction in the main loop.
     filter_length++;
-    filter_coeffs--;
 
     for(n=0; n<buffer_length; n++)
     {
         int sum = rounder;
         for(i=1; i<filter_length; i++)
-            sum -= filter_coeffs[i] * out[n-i];
+            sum -= filter_coeffs[i-1] * out[n-i];
 
         sum = (sum >> 12) + in[n];
 
@@ -94,14 +93,13 @@ void ff_celp_lp_synthesis_filterf(
 {
     int i,n;
 
-    // These two lines are to avoid a -1 subtraction in the main loop
+    // This line is to avoid a +1 subtraction in the main loop
     filter_length++;
-    filter_coeffs--;
 
     for(n=0; n<buffer_length; n++)
     {
         out[n] = in[n];
         for(i=1; i<filter_length; i++)
-            out[n] -= filter_coeffs[i] * out[n-i];
+            out[n] -= filter_coeffs[i-1] * out[n-i];
     }
 }