linux-kernel - [PATCH] IA64: virt_to_page() can be called with NULL arg

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Date:	Mon, 18 Dec 2006 15:11:34 +0300
From:	Kirill Korotaev <dev@...nvz.org>
To:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	Andrew Morton <akpm@...l.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org
Subject: [PATCH] IA64: virt_to_page() can be called with NULL arg

[IA64] virt_to_page() cannot be called with NULL (mainstream bug)

It does not return NULL when arg is NULL.

Signed-Off-By: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Signed-Off-By: Kirill Korotaev <dev@...nvz.org>

--- linus-2.6.git/include/asm-ia64/pgalloc.h.orig	2006-12-18 14:59:09.000000000 +0300
+++ linus-2.6.git/include/asm-ia64/pgalloc.h	2006-12-18 15:07:44.000000000 +0300
@@ -137,7 +137,8 @@ pmd_populate_kernel(struct mm_struct *mm
 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 					 unsigned long addr)
 {
-	return virt_to_page(pgtable_quicklist_alloc());
+	void *pg = pgtable_quicklist_alloc();
+	return pg ? virt_to_page(pg) : NULL;
 }
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
-
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