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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2011-07-25 17:12:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 20:57:08 -0700
commit4b6ddbf7ed4ef2f40e0a27418146eedaa68953c6 (patch)
tree27ab200848514a467f656281073b9c0f86cb7dcc /mm
parent45ebb840257b060ec54416aebffd9747e210962c (diff)
downloadlinux-4b6ddbf7ed4ef2f40e0a27418146eedaa68953c6.tar.gz
pagewalk: fix walk_page_range() don't check find_vma() result properly
The doc of find_vma() says, /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { (snip) Thus, caller should confirm whether the returned vma matches a desired one. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Hiroyuki Kamezawa <kamezawa.hiroyuki@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/pagewalk.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index c3450d53361..606bbb4125d 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -176,7 +176,7 @@ int walk_page_range(unsigned long addr, unsigned long end,
* we can't handled it in the same manner as non-huge pages.
*/
vma = find_vma(walk->mm, addr);
- if (vma && is_vm_hugetlb_page(vma)) {
+ if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma)) {
if (vma->vm_end < next)
next = vma->vm_end;
/*