linux-kernel - Re: [patch 2/2] ptp: fix some locking bugs in ptp

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Date:	Mon, 30 May 2011 08:16:40 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Dan Carpenter <error27@...il.com>
Cc:	Richard Cochran <richard.cochran@...cron.at>,
	"David S. Miller" <davem@...emloft.net>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 2/2] ptp: fix some locking bugs in ptp_read()

On Sun, May 29, 2011 at 10:54:07PM +0300, Dan Carpenter wrote:
> There was an unlock missing on an error path, and a double unlock on
> another error path.
 
Sloppy, sloppy me.

Again, please take this for 3.0-rc2.

Thanks,
Richard

> Signed-off-by: Dan Carpenter <error27@...il.com>
> 
> diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
> index 93fa22d..e7f301da2 100644
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -130,8 +130,10 @@ ssize_t ptp_read(struct posix_clock *pc,
>  		return -ERESTARTSYS;
>  	}
>  
> -	if (ptp->defunct)
> +	if (ptp->defunct) {
> +		mutex_unlock(&ptp->tsevq_mux);
>  		return -ENODEV;
> +	}
>  
>  	spin_lock_irqsave(&queue->lock, flags);
>  
> @@ -151,10 +153,8 @@ ssize_t ptp_read(struct posix_clock *pc,
>  
>  	mutex_unlock(&ptp->tsevq_mux);
>  
> -	if (copy_to_user(buf, event, cnt)) {
> -		mutex_unlock(&ptp->tsevq_mux);
> +	if (copy_to_user(buf, event, cnt))
>  		return -EFAULT;
> -	}
>  
>  	return cnt;
>  }
> --
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