linux-kernel - [PATCH 3.12 18/39] m32r: fix potential NULL-pointer dereference

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Date:	Mon, 25 Jan 2016 12:49:59 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oliver Neukum <ONeukum@...e.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 18/39] m32r: fix potential NULL-pointer dereference

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit fecf3743b824ce4eb275ed4a1d6aee9494f6a966 upstream.

Add missing check for memory allocation fail.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Hirokazu Takata <takata@...ux-m32r.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oliver Neukum <ONeukum@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/m32r/include/asm/pgalloc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/m32r/include/asm/pgalloc.h b/arch/m32r/include/asm/pgalloc.h
index 0fc736198979..ac4208bcc5ad 100644
--- a/arch/m32r/include/asm/pgalloc.h
+++ b/arch/m32r/include/asm/pgalloc.h
@@ -43,6 +43,8 @@ static __inline__ pgtable_t pte_alloc_one(struct mm_struct *mm,
 {
 	struct page *pte = alloc_page(GFP_KERNEL|__GFP_ZERO);
 
+	if (!pte)
+		return NULL;
 	pgtable_page_ctor(pte);
 	return pte;
 }
-- 
2.7.0