netdev - Re: [patch] bridge: make buffer larger in br

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Date:	Fri, 7 Dec 2012 09:31:07 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] bridge: make buffer larger in br_setlink()

On 12/07/12 at 09:18am, Dan Carpenter wrote:
> __IFLA_BRPORT_MAX is one larger than IFLA_BRPORT_MAX.  We pass
> IFLA_BRPORT_MAX to nla_parse_nested() so we need IFLA_BRPORT_MAX + 1
> elements.  Also Smatch complains that we read past the end of the array
> when in br_set_port_flag() when it's called with IFLA_BRPORT_FAST_LEAVE.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> Only needed in linux-next.
> 
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 850b7d1..cfc5cfe 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -239,7 +239,7 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
>  	struct ifinfomsg *ifm;
>  	struct nlattr *protinfo;
>  	struct net_bridge_port *p;
> -	struct nlattr *tb[IFLA_BRPORT_MAX];
> +	struct nlattr *tb[__IFLA_BRPORT_MAX];
>  	int err;
>  
>  	ifm = nlmsg_data(nlh);

I know it's nitpicking but could you use IFLA_BRPORT_MAX+1 for
consistency?
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