linux-kernel - Re: [PATCH] Fix check after use in kernel/exit.c

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Message-ID: <20080308083637.GA23555@elte.hu>
Date:	Sat, 8 Mar 2008 09:36:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"G. Vaughan" <gvaughan@....nasa.gov>, Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] Fix check after use in kernel/exit.c


* WANG Cong <xiyou.wangcong@...il.com> wrote:

> mm_release won't check the mm_struct pointer, so it should be checked 
> before this call.

> @@ -582,9 +582,9 @@ static void exit_mm(struct task_struct * tsk)
>  {
>  	struct mm_struct *mm = tsk->mm;
>  
> -	mm_release(tsk, mm);
>  	if (!mm)
>  		return;
> +	mm_release(tsk, mm);

thanks, applied. I'm wondering why this never seems to hit in practice.

	Ingo
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