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: hurd: Do not allow unmapping address 0

	* sysdeps/mach/munmap.c (__munmap): Return EINVAL if `addr' is 0.
---
 sysdeps/mach/munmap.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'sysdeps/mach/munmap.c')

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))
     {
-- 
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