linux-kernel - [patch] NULL pointer check for vma->vm

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Message-ID: <3fd7d7a70801312339p2a142096p83ed286c81379728@mail.gmail.com>
Date:	Fri, 1 Feb 2008 16:39:07 +0900
From:	"Kenichi Okuyama" <kenichi.okuyama@...il.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: [patch] NULL pointer check for vma->vm_mm

Dear all,

I was looking at the ./mm/rmap.c .. I found that, in function
"page_referenced_one()",
   struct mm_struct *mm = vma->vm_mm;
was being refererred without NULL check.

Though I do agree that this works for most of the cases, I thought it
is better to add
BUG_ON() for case of mm being NULL.

attached is the patch for this

thank you in advance for taking your time.
best regards,
-- 
(Kenichi Okuyama)
URL: http://www.dd.iij4u.or.jp/~okuyamak/

Download attachment "patch.mm" of type "application/octet-stream" (316 bytes)