From: David van Moolenbroek <david@minix3.org>
Date: Tue, 5 Jan 2010 09:40:07 +0000 (+0000)
Subject: VM: make munmap(2) round length up, not down (reported by Althaf K Backer)
X-Git-Tag: v3.1.6~114
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/man.dnssec-keyfromlabel.html?a=commitdiff_plain;h=be992434e7e646b6a07f40bead5d84298024d4d3;p=minix.git

VM: make munmap(2) round length up, not down (reported by Althaf K Backer)
---

diff --git a/servers/vm/mmap.c b/servers/vm/mmap.c
index 5abc459b6..686db4779 100644
--- a/servers/vm/mmap.c
+++ b/servers/vm/mmap.c
@@ -374,7 +374,8 @@ PUBLIC int do_munmap(message *m)
         }
  
 	len = m->VMUM_LEN;
-	len -= len % VM_PAGE_SIZE;
+	if (len % VM_PAGE_SIZE)
+		len += VM_PAGE_SIZE - (len % VM_PAGE_SIZE);
 
         if(addr != vr->vaddr || len > vr->length || len < VM_PAGE_SIZE) {
                 return EFAULT;