From 40524876e9a66fa6dbf0eb6980cd98071a9d7923 Mon Sep 17 00:00:00 2001
From: Olivier Poitrey <rs@dailymotion.com>
Date: Thu, 6 Sep 2012 22:49:04 +0200
Subject: [PATCH] Add some security around wrongly typed URL argument

---
 SDWebImage/SDWebImageManager.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index e61f01486..08226adb6 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -123,6 +123,10 @@ - (void)downloadWithURL:(NSURL *)url delegate:(id<SDWebImageManagerDelegate>)del
     {
         url = [NSURL URLWithString:(NSString *)url];
     }
+    else if (![url isKindOfClass:NSURL.class])
+    {
+        url = nil; // Prevent some common crashes due to common wrong values passed like NSNull.null for instance
+    }
 
     if (!url || !delegate || (!(options & SDWebImageRetryFailed) && [failedURLs containsObject:url]))
     {