From 352b0969e23c83074cb8bfb4fb268df45848a983 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 8 Apr 2014 00:19:07 +0200
Subject: [PATCH] swresample/resample: Limit filter length

Related to CID1197063

The limit choosen is arbitrary and much larger than what makes sense.
It avoids the need for checking arithmetic operations with the length for overflow

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit f9158b01d0f3effb58e87fb07db0382bc1e47de5)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libswresample/resample.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libswresample/resample.c b/libswresample/resample.c
index 8b1b6ca9af..b968447444 100644
--- a/libswresample/resample.c
+++ b/libswresample/resample.c
@@ -229,6 +229,11 @@ static ResampleContext *resample_init(ResampleContext *c, int out_rate, int in_r
             av_assert0(0);
         }
 
+        if (filter_size/factor > INT32_MAX/256) {
+            av_log(NULL, AV_LOG_ERROR, "Filter length too large\n");
+            goto error;
+        }
+
         c->phase_shift   = phase_shift;
         c->phase_mask    = phase_count - 1;
         c->linear        = linear;