linux-kernel - Re: [PATCH] net, TTY: initialize tty->driver

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Message-ID: <506E95A0.2020903@suse.cz>
Date:	Fri, 05 Oct 2012 10:09:04 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Sasha Levin <sasha.levin@...cle.com>
CC:	samuel@...tiz.org, davem@...emloft.net, gregkh@...uxfoundation.org,
	alan@...ux.intel.com, levinsasha928@...il.com, davej@...hat.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net, TTY: initialize tty->driver_data before usage

On 10/05/2012 02:01 AM, Sasha Levin wrote:
> Commit 9c650ffc ("TTY: ircomm_tty, add tty install") split _open() to
> _install() and _open(). It also moved the initialization of driver_data
> out of open(), but never added it to install() - causing a NULL ptr
> deref whenever the driver was used.
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>  net/irda/ircomm/ircomm_tty.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
> index 95a3a7a..496ce2c 100644
> --- a/net/irda/ircomm/ircomm_tty.c
> +++ b/net/irda/ircomm/ircomm_tty.c
> @@ -421,6 +421,8 @@ static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
>  		hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
>  	}
>  
> +	tty->driver_data = self;
> +
>  	return tty_port_install(&self->port, driver, tty);

Yes, a good catch.

Acked-by: Jiri Slaby <jslaby@...e.cz>

thanks,
-- 
js
suse labs
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