linux-kernel - RE: [patch] rapidio: potential null deref in rio_setup

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Date:	Mon, 29 Aug 2011 06:51:53 -0700
From:	"Bounine, Alexandre" <Alexandre.Bounine@....com>
To:	"Dan Carpenter" <error27@...il.com>,
	"Matt Porter" <mporter@...nel.crashing.org>
Cc:	"open list" <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>
Subject: RE: [patch] rapidio: potential null deref in rio_setup_device()

Dan Carpenter <error27@...il.com> wrote:

> The "goto cleanup" path can dereference "rswitch" which is NULL here.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> This is sort of embarrassing, I've patched this function before but
> missed this.  Hopefully it's right now.
> 
> diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
> index 0914f49..882cef9 100644
> --- a/drivers/rapidio/rio-scan.c
> +++ b/drivers/rapidio/rio-scan.c
> @@ -432,7 +432,7 @@ static struct rio_dev __devinit
> *rio_setup_device(struct rio_net *net,
>  		/* Assign component tag to device */
>  		if (next_comptag >= 0x10000) {
>  			pr_err("RIO: Component Tag Counter Overflow\n");
> -			goto cleanup;
> +			goto out_rdev;
>  		}
>  		rio_mport_write_config_32(port, destid, hopcount,
>  					  RIO_COMPONENT_TAG_CSR,
next_comptag);
> @@ -518,7 +518,7 @@ static struct rio_dev __devinit
> *rio_setup_device(struct rio_net *net,
>  cleanup:
>  	if (rio_is_switch(rdev))
>  		kfree(rswitch->route_table);

Because rswitch is set not-NULL only for switch devices the check below
can make things simpler: 
  cleanup:
	if (rswitch)
  		kfree(rswitch->route_table);

> -
> +out_rdev:
>  	kfree(rdev);
>  	return NULL;
>  }
--
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