netdev - Re: [patch v2] ipvs: uninitialized data with IP_VS

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Message-ID: <alpine.LFD.2.11.1412072032420.1885@ja.home.ssi.bg>
Date:	Sun, 7 Dec 2014 20:39:35 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Dan Carpenter <dan.carpenter@...cle.com>
cc:	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] ipvs: uninitialized data with IP_VS_IPV6


	Hello,

On Sat, 6 Dec 2014, Dan Carpenter wrote:

> The app_tcp_pkt_out() function expects "*diff" to be set and ends up
> using uninitialized data if CONFIG_IP_VS_IPV6 is turned on.
> 
> The same issue is there in app_tcp_pkt_in().  Thanks to Julian Anastasov
> for noticing that.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> v2: fix app_tcp_pkt_in() as well.  This is an old bug.

	Thanks! It will not break seqs for IPv6 control
connection, only that we do not support FTP yet :( I have
the doubt whether this should be classified as bugfix :)
I guess, it is a net-next material, right?

	Simon, please apply.

Acked-by: Julian Anastasov <ja@....bg>

> diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
> index 1d5341f..5d3daae 100644
> --- a/net/netfilter/ipvs/ip_vs_ftp.c
> +++ b/net/netfilter/ipvs/ip_vs_ftp.c
> @@ -183,6 +183,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
>  	struct nf_conn *ct;
>  	struct net *net;
>  
> +	*diff = 0;
> +
>  #ifdef CONFIG_IP_VS_IPV6
>  	/* This application helper doesn't work with IPv6 yet,
>  	 * so turn this into a no-op for IPv6 packets
> @@ -191,8 +193,6 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
>  		return 1;
>  #endif
>  
> -	*diff = 0;
> -
>  	/* Only useful for established sessions */
>  	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
>  		return 1;
> @@ -322,6 +322,9 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
>  	struct ip_vs_conn *n_cp;
>  	struct net *net;
>  
> +	/* no diff required for incoming packets */
> +	*diff = 0;
> +
>  #ifdef CONFIG_IP_VS_IPV6
>  	/* This application helper doesn't work with IPv6 yet,
>  	 * so turn this into a no-op for IPv6 packets
> @@ -330,9 +333,6 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
>  		return 1;
>  #endif
>  
> -	/* no diff required for incoming packets */
> -	*diff = 0;
> -
>  	/* Only useful for established sessions */
>  	if (cp->state != IP_VS_TCP_S_ESTABLISHED)
>  		return 1;

Regards

--
Julian Anastasov <ja@....bg>
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