linux-kernel - Re: [PATCH] rmap: validate pointer in anon_vma

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Message-ID: <CAHz2CGUo2SevOPXw7PqNyUroc4xD2Z4fOHEFUeJ+FQU-6rib0g@mail.gmail.com>
Date:	Wed, 7 May 2014 12:28:14 +0800
From:	Jianyu Zhan <nasa4836@...il.com>
To:	Leon Ma <xindong.ma@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, iamjoonsoo.kim@....com,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	kirill.shutemov@...ux.intel.com, gorcunov@...il.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rmap: validate pointer in anon_vma_clone

On Wed, May 7, 2014 at 10:32 AM, Leon Ma <xindong.ma@...el.com> wrote:
> If memory allocation failed in first loop, root will be NULL and
> will lead to kernel panic.

Hello, Leon,

I am afraid not.  unlock_anon_vma_root() has a sanity check NULLness of root,
so it is impossible to panic for a dangling root pointer.



Thanks,
Jianyu Zhan
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