linux-kernel - Re: [2.6 patch] acpi/ec.c: fix use-after-free

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Message-ID: <471F7DA6.2060907@gmail.com>
Date:	Wed, 24 Oct 2007 21:15:18 +0400
From:	Alexey Starikovskiy <aystarik@...il.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Len Brown <len.brown@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] acpi/ec.c: fix use-after-free

Adrian,

commit 30c08574da0ead1a47797ce028218ce5b2de61c7 can not introduce use-after-free.

Please check...

Regards,
Alex.
Adrian Bunk wrote:
> This patch fixes a use-after-free introduced by
> commit 30c08574da0ead1a47797ce028218ce5b2de61c7.
> 
> Spotted by the Coverity checker.
> 
> Signed-off-by: Adrian Bunk <bunk@...nel.org>
> 
> ---
> --- linux-2.6/drivers/acpi/ec.c.old	2007-10-23 19:39:47.000000000 +0200
> +++ linux-2.6/drivers/acpi/ec.c	2007-10-23 19:34:55.000000000 +0200
> @@ -434,11 +442,11 @@
>  EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
>  
>  void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
>  {
> -	struct acpi_ec_query_handler *handler;
> +	struct acpi_ec_query_handler *handler, *tmp;
>  	mutex_lock(&ec->lock);
> -	list_for_each_entry(handler, &ec->list, node) {
> +	list_for_each_entry_safe(handler, tmp, &ec->list, node) {
>  		if (query_bit == handler->query_bit) {
>  			list_del(&handler->node);
>  			kfree(handler);
>  		}
> 
> -
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