3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jianguo Wu <wujian...@huawei.com>
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 <wujian...@huawei.com>
Cc: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
Cc: Mel Gorman <mgor...@suse.de>
Cc: qiuxishi <qiuxi...@huawei.com>
Cc: Hanjun Guo <guohan...@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
mm/rmap.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -623,7 +623,11 @@ pte_t *__page_check_address(struct page
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;
}
--
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