From 61a7c53a089b368cbed0c2c8f3a47cd170fdb808 Mon Sep 17 00:00:00 2001
From: theraven <theraven@72102866-910b-0410-8b05-ffd578937521>
Date: Thu, 14 Jul 2011 21:10:59 +0000
Subject: [PATCH] Handle NULL arguments to block copy / release.

---
 blocks_runtime.m | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/blocks_runtime.m b/blocks_runtime.m
index 9d694af..b1f472f 100644
--- a/blocks_runtime.m
+++ b/blocks_runtime.m
@@ -455,6 +455,7 @@ void _Block_object_dispose(const void *object, const int flags)
 // Copy a block to the heap if it's still on the stack or increments its retain count.
 void *_Block_copy(void *src)
 {
+	if (NULL == src) { return NULL; }
 	fprintf(stderr, "_Block_copy()\n");
 	struct block_literal *self = src;
 	struct block_literal *ret = self;
@@ -485,6 +486,7 @@ void *_Block_copy(void *src)
 // Release a block and frees the memory when the retain count hits zero.
 void _Block_release(void *src)
 {
+	if (NULL == src) { return; }
 	struct block_literal *self = src;
 	
 	extern void _NSConcreteStackBlock;