netdev - Re: [PATCH] ax25: Add missing dev_put in ax25

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Date:	Mon, 28 Sep 2009 19:46:06 +0200
From:	Bernard Pidoux <bernard.pidoux@...c.fr>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.net>,
	Bernard Pidoux F6BVP <f6bvp@...e.fr>,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-hams <linux-hams@...r.kernel.org>
Subject: Re: [PATCH] ax25: Add missing dev_put in ax25_setsockopt

Hi take this one too. Hi.
Applied.

Thanks Ralf.

Bernard

Ralf Baechle a écrit :
> ax25_setsockopt SO_BINDTODEVICE is missing a dev_put call in case of
> success.  Re-order code to fix this bug.  While at it also reformat two
> lines of code to comply with the Linux coding style.
> 
> Initial patch by Jarek Poplawski <jarkao2@...il.com>.
> 
> Reported-by: Bernard Pidoux F6BVP <f6bvp@...e.fr>
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> 
> ---
> Counter-proposal.  Reordering all the code avoids the need for a 2nd dev_put
> and is more readable.
> 
>    Ralf
> 
>  net/ax25/af_ax25.c |   19 ++++++++++---------
>  1 files changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
> index fbcac76..4102de1 100644
> --- a/net/ax25/af_ax25.c
> +++ b/net/ax25/af_ax25.c
> @@ -641,15 +641,10 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
>  
>  	case SO_BINDTODEVICE:
>  		if (optlen > IFNAMSIZ)
> -			optlen=IFNAMSIZ;
> -		if (copy_from_user(devname, optval, optlen)) {
> -		res = -EFAULT;
> -			break;
> -		}
> +			optlen = IFNAMSIZ;
>  
> -		dev = dev_get_by_name(&init_net, devname);
> -		if (dev == NULL) {
> -			res = -ENODEV;
> +		if (copy_from_user(devname, optval, optlen)) {
> +			res = -EFAULT;
>  			break;
>  		}
>  
> @@ -657,12 +652,18 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
>  		   (sock->state != SS_UNCONNECTED ||
>  		    sk->sk_state == TCP_LISTEN)) {
>  			res = -EADDRNOTAVAIL;
> -			dev_put(dev);
> +			break;
> +		}
> +
> +		dev = dev_get_by_name(&init_net, devname);
> +		if (!dev) {
> +			res = -ENODEV;
>  			break;
>  		}
>  
>  		ax25->ax25_dev = ax25_dev_ax25dev(dev);
>  		ax25_fillin_cb(ax25, ax25->ax25_dev);
> +		dev_put(dev);
>  		break;
>  
>  	default:
> 

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