From f8c6d30b766fc8eb83f5b7983ff8a5a9b3189365 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Thu, 14 Nov 2013 14:31:19 -0800 Subject: xtensa: fix potential NULL-pointer dereference Add missing check for memory allocation fail. Signed-off-by: Kirill A. Shutemov Cc: Chris Zankel Cc: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/xtensa/include/asm/pgalloc.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h index cf914c8c249a..037671a655dc 100644 --- a/arch/xtensa/include/asm/pgalloc.h +++ b/arch/xtensa/include/asm/pgalloc.h @@ -51,9 +51,13 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr) { + pte_t *pte; struct page *page; - page = virt_to_page(pte_alloc_one_kernel(mm, addr)); + pte = pte_alloc_one_kernel(mm, addr); + if (!pte) + return NULL; + page = virt_to_page(pte); pgtable_page_ctor(page); return page; } -- cgit v1.2.3