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pagewalk: fix walk_page_range() don't check find_vma() result properly

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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 <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Hiroyuki Kamezawa <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KOSAKI Motohiro 2011-07-25 17:12:09 -07:00 • committed by Linus Torvalds
commit 4b6ddbf7ed
1 changed files with 1 additions and 1 deletions
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2
mm/pagewalk.c
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@ -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;
/*