linux-kernel - [PATCH] score: Fix dereference of NULL pointer in local_flush_tlb

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Message-ID: <4B707F6E.2090108@gmail.com>
Date:	Mon, 08 Feb 2010 22:17:34 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	liqin.chen@...plusct.com, arnd@...db.de,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] score: Fix dereference of NULL pointer in local_flush_tlb_page()

Don't dereference vma if it's NULL.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/arch/score/mm/tlb-score.c b/arch/score/mm/tlb-score.c
index 4fa5aa5..6fdb100 100644
--- a/arch/score/mm/tlb-score.c
+++ b/arch/score/mm/tlb-score.c
@@ -158,7 +158,7 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
 
 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 {
-	if (!vma || vma->vm_mm->context != 0) {
+	if (vma && vma->vm_mm->context != 0) {
 		unsigned long flags;
 		int oldpid, newpid, idx;
 		unsigned long vma_ASID = vma->vm_mm->context;
--
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