linux-kernel - Re: [patch v2] rapidio: use after free in unregister function

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Date:	Sat, 06 Jul 2013 09:26:27 +1000
From:	Ryan Mallon <rmallon@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Matt Porter <mporter@...nel.crashing.org>,
	Alexandre Bounine <alexandre.bounine@....com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] rapidio: use after free in unregister function

On 06/07/13 06:39, Dan Carpenter wrote:

> We're freeing the list iterator so we can't move to the next entry.
> Since there is only one matching mport_id, we can just break after
> finding it.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> v2: cleaner fix than v1
> 
> diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
> index f4f30af..2e8a20c 100644
> --- a/drivers/rapidio/rio.c
> +++ b/drivers/rapidio/rio.c
> @@ -1715,11 +1715,13 @@ int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
>  		    (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
>  			port->nscan = NULL;
>  
> -	list_for_each_entry(scan, &rio_scans, node)
> +	list_for_each_entry(scan, &rio_scans, node) {
>  		if (scan->mport_id == mport_id) {
>  			list_del(&scan->node);
>  			kfree(scan);
> +			break;
>  		}
> +	}
>  
>  	mutex_unlock(&rio_mport_list_lock);
>  


Reviewed-by: Ryan Mallon <rmallon@...il.com>

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