linux-kernel - Re: [PATCH] cdc-acm: don't unlock acm->mutex on error path

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Date:	Wed, 23 Jul 2008 16:36:05 +0300
From:	Andrei Popa <andrei.popa@...eo.ro>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, gregkh@...e.de
Subject: Re: [PATCH] cdc-acm: don't unlock acm->mutex on error path


It's ok now, thanks.

On Wed, 2008-07-23 at 17:23 +0400, Alexey Dobriyan wrote:
> On Wed, Jul 23, 2008 at 03:52:36PM +0300, Andrei Popa wrote:
> > I installed gnokii-0.6.22-r2 and gave the command "gnokii --identify"
> > and the kernel oopsed:
> > 
> > BUG: unable to handle kernel NULL pointer dereference at 00000458
> > IP: [<c0444b52>] mutex_unlock+0x0/0xb
> >  [<c03830ae>] acm_tty_open+0x4c/0x214
> 
> Try this:
> 
> [PATCH] cdc-acm: don't unlock acm->mutex on error path
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
> 
>  drivers/usb/class/cdc-acm.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/usb/class/cdc-acm.c
> +++ b/drivers/usb/class/cdc-acm.c
> @@ -595,8 +595,8 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
>  	tasklet_schedule(&acm->urb_task);
>  
>  done:
> -err_out:
>  	mutex_unlock(&acm->mutex);
> +err_out:
>  	mutex_unlock(&open_mutex);
>  	return rv;
>  
> 

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