From 7aa475db4ce168401167dc2ffed6221493ae2db4 Mon Sep 17 00:00:00 2001
From: Richard Braun <rbraun@sceen.net>
Date: Tue, 20 Nov 2012 23:17:12 +0000
Subject: Fix calls to vm_map when size is 0

* vm/vm_map.c (vm_map_enter): return KERN_INVALID_ARGUMENT if size is 0.
* vm/vm_user.c (vm_map): Likewise.
---
 vm/vm_map.c  | 3 +++
 vm/vm_user.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/vm/vm_map.c b/vm/vm_map.c
index c46afc0..22fa836 100644
--- a/vm/vm_map.c
+++ b/vm/vm_map.c
@@ -784,6 +784,9 @@ kern_return_t vm_map_enter(
 
 #define	RETURN(value)	{ result = value; goto BailOut; }
 
+	if (size == 0)
+		return KERN_INVALID_ARGUMENT;
+
  StartAgain: ;
 
 	start = *address;
diff --git a/vm/vm_user.c b/vm/vm_user.c
index a8ce982..6fe398e 100644
--- a/vm/vm_user.c
+++ b/vm/vm_user.c
@@ -342,6 +342,9 @@ kern_return_t vm_map(
                 return(KERN_INVALID_ARGUMENT);
         }
 
+	if (size == 0)
+		return KERN_INVALID_ARGUMENT;
+
 	*address = trunc_page(*address);
 	size = round_page(size);
 
-- 
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