From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 24 Nov 2009 13:43:52 +0000 (-0500)
Subject: fix the arch checks in MREMAP_FIXED case
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=097eed103862f9c6a97f2e415e21d1134017b135;p=linux.git

fix the arch checks in MREMAP_FIXED case

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/mm/mremap.c b/mm/mremap.c
index 9d0753983dcba..84efffb2d2c4e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -325,6 +325,7 @@ static unsigned long mremap_to(unsigned long addr,
 	struct vm_area_struct *vma;
 	unsigned long ret = -EINVAL;
 	unsigned long charged = 0;
+	unsigned long map_flags;
 
 	if (new_addr & ~PAGE_MASK)
 		goto out;
@@ -362,9 +363,23 @@ static unsigned long mremap_to(unsigned long addr,
 		goto out;
 	}
 
-	ret = move_vma(vma, addr, old_len, new_len, new_addr);
+	map_flags = MAP_FIXED;
+	if (vma->vm_flags & VM_MAYSHARE)
+		map_flags |= MAP_SHARED;
+	ret = arch_mmap_check(new_addr, new_len, map_flags);
+	if (ret)
+		goto out1;
+	ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff +
+				((addr - vma->vm_start) >> PAGE_SHIFT),
+				map_flags);
 	if (ret & ~PAGE_MASK)
-		vm_unacct_memory(charged);
+		goto out1;
+
+	ret = move_vma(vma, addr, old_len, new_len, new_addr);
+	if (!(ret & ~PAGE_MASK))
+		goto out;
+out1:
+	vm_unacct_memory(charged);
 
 out:
 	return ret;