From: Hugh Dickins <hugh@veritas.com>
Date: Sat, 25 Jun 2005 21:54:33 +0000 (-0700)
Subject: [PATCH] mm: fix remap_pte_range BUG
X-Git-Tag: v2.6.13-rc1~68^2~226
X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=2d15cab85b85a56cc886037cab43cc292923ff22;p=karo-tx-linux.git

[PATCH] mm: fix remap_pte_range BUG

Out-of-tree user of remap_pfn_range hit kernel BUG at mm/memory.c:1112!  It
passes an unrounded size to remap_pfn_range, which was okay before 2.6.12,
but misses remap_pte_range's new end condition.  An audit of all the other
ptwalks confirms that this is the only one so exposed.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index c256175742ac..beabdefa6254 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1139,7 +1139,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
 {
 	pgd_t *pgd;
 	unsigned long next;
-	unsigned long end = addr + size;
+	unsigned long end = addr + PAGE_ALIGN(size);
 	struct mm_struct *mm = vma->vm_mm;
 	int err;