linux-kernel - Re: [PATCH 2/5] MEDIA: ttusbir, fix double free

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Date:	Tue, 9 Apr 2013 11:36:53 +0100
From:	Sean Young <sean@...s.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jirislaby@...il.com, linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 2/5] MEDIA: ttusbir, fix double free

On Thu, Apr 04, 2013 at 10:32:09PM +0200, Jiri Slaby wrote:
> rc_unregister_device already calls rc_free_device to free the passed
> device. But in one of ttusbir's probe fail paths, we call
> rc_unregister_device _and_ rc_free_device. This is wrong and results
> in a double free.
> 
> Instead, set rc to NULL resulting in rc_free_device being a noop.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Sean Young <sean@...s.org>
> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> Cc: linux-media@...r.kernel.org
> ---
>  drivers/media/rc/ttusbir.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/rc/ttusbir.c b/drivers/media/rc/ttusbir.c
> index cf0d47f..891762d 100644
> --- a/drivers/media/rc/ttusbir.c
> +++ b/drivers/media/rc/ttusbir.c
> @@ -347,6 +347,7 @@ static int ttusbir_probe(struct usb_interface *intf,
>  	return 0;
>  out3:
>  	rc_unregister_device(rc);
> +	rc = NULL;
>  out2:
>  	led_classdev_unregister(&tt->led);
>  out:
> -- 

Acked-by: Sean Young <sean@...s.org>


Sean
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