linux-kernel - Re: [PATCH] sysctl: Use BUG

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Date:	Tue, 4 Sep 2012 16:18:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Prasad Joshi <prasadjoshi.linux@...il.com>
Cc:	ebiederm@...ssion.com, viro@...iv.linux.org.uk,
	lucas.demarchi@...fusion.mobi, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysctl: Use BUG_ON instead of BUG

On Mon,  3 Sep 2012 09:00:25 +0530
Prasad Joshi <prasadjoshi.linux@...il.com> wrote:

> The use of if (!head) BUG(); can be replaced with single line
> BUG_ON(!head).
> 
> Signed-off-by: Prasad Joshi <prasadjoshi.linux@...il.com>
> ---
>  fs/proc/proc_sysctl.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index dfafeb2..63bdfa0 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -266,8 +266,7 @@ void sysctl_head_put(struct ctl_table_header *head)
>  
>  static struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
>  {
> -	if (!head)
> -		BUG();
> +	BUG_ON(!head);
>  	spin_lock(&sysctl_lock);
>  	if (!use_table(head))
>  		head = ERR_PTR(-ENOENT);

We could just remove the check altogether.  The resulting NULL pointer
deref oops in use_table() will give us the same info as that BUG().

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