diff options
| author | Jianguo Wu <wujianguo@huawei.com> | 2013-12-18 17:08:59 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-04-02 00:59:00 +0100 |
| commit | 358c10d5ce93cf7cf3ae6cd66e2e533d680591d5 (patch) | |
| tree | b9eea76c1547d3c8fdcb6bbfd2f729e4ed4dff65 | |
| parent | c725cf148008d81eac7fe4bebff7367ae2aa0aa2 (diff) | |
mm/hugetlb: check for pte NULL pointer in __page_check_address()
commit 98398c32f6687ee1e1f3ae084effb4b75adb0747 upstream.
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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -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 8685697b88b2..52a2f364f087 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -581,7 +581,11 @@ 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 = &mm->page_table_lock; goto check; } |