Re: [PATCH] [media] rc: ttusbir: fix potential double free in ttusbir_probe()

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On Tue, Apr 09, 2013 at 05:43:09PM +0800, Wei Yongjun wrote:
> From: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
> 
> Since rc_unregister_device() frees its argument, the subsequently
> call to rc_free_device() on the same variable will cause a double
> free bug. Fix by set argument to NULL, thus when fall through to
> rc_free_device(), nothing will be done there.
> 
> Signed-off-by: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
> ---
>  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:

The patch is right, so thanks for that. However, some else has beaten you
to it, I'm afraid:

http://www.spinics.net/lists/linux-media/msg62058.html

I guess it's up Mauro to decide which one to accept.


Sean
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