linux-kernel - Re: [PATCH] appletalk: prevent unregister_sysctl

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Date:	Tue, 24 Oct 2006 14:27:11 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Akinobu Mita <akinobu.mita@...il.com>,
	linux-kernel@...r.kernel.org, akpm@...l.org,
	Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
Subject: Re: [PATCH] appletalk: prevent unregister_sysctl_table() with a NULL argument

On Tue, Oct 24, 2006 at 05:53:57PM +0900, Akinobu Mita wrote:
> If register_sysctl_table() fails during module initalization,
> NULL pointer dereference will happen in the module cleanup.

> --- work-fault-inject.orig/net/appletalk/sysctl_net_atalk.c
> +++ work-fault-inject/net/appletalk/sysctl_net_atalk.c
> @@ -78,5 +78,6 @@ void atalk_register_sysctl(void)
>
>  void atalk_unregister_sysctl(void)
>  {
> -	unregister_sysctl_table(atalk_table_header);
> +	if (atalk_table_header)
> +		unregister_sysctl_table(atalk_table_header);

Make sure that module won't load if sysctl table can't be registered,
instead.

-
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