From fd15a59b20220a2d89d628ecebfcaad1ddefe871 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 16 Apr 2014 23:16:15 +0200
Subject: [PATCH] hurd: Do not allow unmapping address 0

	* sysdeps/mach/munmap.c (__munmap): Return EINVAL if `addr' is 0.
---
 ChangeLog             | 4 ++++
 sysdeps/mach/munmap.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index ea70b28..970dedb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2014-04-16  Samuel Thibault  <samuel.thibault@ens-lyon.org>
+
+	* sysdeps/mach/munmap.c (__munmap): Return EINVAL if `addr' is 0.
+
 2014-04-16  Stefan Liebler  <stli@linux.vnet.ibm.com>
 
 	* sysdeps/s390/fpu/libm-test-ulps: Regenerate.
diff --git a/sysdeps/mach/munmap.c b/sysdeps/mach/munmap.c
index f8c416f..cfd5daa 100644
--- a/sysdeps/mach/munmap.c
+++ b/sysdeps/mach/munmap.c
@@ -27,6 +27,13 @@ int
 __munmap (__ptr_t addr, size_t len)
 {
   kern_return_t err;
+
+  if (addr == 0)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
   if (err = __vm_deallocate (__mach_task_self (),
 			     (vm_address_t) addr, (vm_size_t) len))
     {
-- 
2.7.4