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| author | Jianguo Wu <wujianguo@huawei.com> | 2013-12-18 17:08:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-18 19:04:52 -0800 |
| commit | 98398c32f6687ee1e1f3ae084effb4b75adb0747 (patch) | |
| tree | b260bca32fc6148340d88e1cdf1f8eb646e4f3f0 /mm/rmap.c | |
| parent | 7ac181568342ec618d4da1ab03c2babcaa7ee84f (diff) | |
| download | lwn-98398c32f6687ee1e1f3ae084effb4b75adb0747.tar.gz lwn-98398c32f6687ee1e1f3ae084effb4b75adb0747.zip | |
mm/hugetlb: check for pte NULL pointer in __page_check_address()
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 <wujianguo@huawei.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: qiuxishi <qiuxishi@huawei.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 55c8b8dc9ffb..068522d8502a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -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; } |