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mm/hugetlb: check for pte NULL pointer in __page_check_address()

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In __page_check_address(), if address's pud is not present,
huge_pte_offset() will return NULL, we should check the return value.

Signed-off-by: Jianguo Wu <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: qiuxishi <[email protected]>
Cc: Hanjun Guo <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jianguo Wu 2013-12-18 17:08:59 -08:00 • committed by Linus Torvalds
commit 98398c32f6
1 changed files with 4 additions and 0 deletions
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4
mm/rmap.c
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@ -600,7 +600,11 @@ pte_t *__page_check_address(struct page *page, struct mm_struct *mm,
spinlock_t *ptl;
if (unlikely(PageHuge(page))) {
/* when pud is not present, pte will be NULL */
pte = huge_pte_offset(mm, address);
if (!pte)
return NULL;
ptl = huge_pte_lockptr(page_hstate(page), mm, pte);
goto check;
}