[PATCH 1/4] pagewalk: Fix walk_page_range() don't check find_vma() result properly
From: KOSAKI Motohiro <hidden>
Date: 2011-05-25 07:08:58
Also in:
lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
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 <redacted>
---
mm/pagewalk.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index c3450d5..606bbb4 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; /*
--
1.7.3.1
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