netdev - Re: [patch] ipvs: off by one in set_sctp

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Message-ID: <alpine.LFD.2.00.1304201504510.1593@ja.ssi.bg>
Date:	Sat, 20 Apr 2013 15:25:21 +0300 (EEST)
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>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org
Subject: Re: [patch] ipvs: off by one in set_sctp_state()


	Hello,

On Sat, 20 Apr 2013, Dan Carpenter wrote:

> The sctp_events[] come from sch->type in set_sctp_state().  They are
> between 0-255 so that means we need 256 elements in the array.
> 
> I believe that because of how the code is aligned there is normally a
> hole after sctp_events[] so this patch doesn't actually change anything.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> This is static checker stuff.  I'm not very familiar with this code.
> 
> diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
> index 6e14a7b..8646488 100644
> --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
> +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
> @@ -208,7 +208,7 @@ enum ipvs_sctp_event_t {
>  	IP_VS_SCTP_EVE_LAST
>  };
>  
> -static enum ipvs_sctp_event_t sctp_events[255] = {
> +static enum ipvs_sctp_event_t sctp_events[256] = {
>  	IP_VS_SCTP_EVE_DATA_CLI,
>  	IP_VS_SCTP_EVE_INIT_CLI,
>  	IP_VS_SCTP_EVE_INIT_ACK_CLI,

	There are more confusing (still, non-fatal)
problems in this IPVS-SCTP support, eg.

        if (direction == IP_VS_DIR_OUTPUT)
-               event++;
+               event *= 2;

	I guess we are running with wrong timeouts.

	Also, I'm not sure we support properly the
one-way states as done for TCP (IP_VS_DIR_INPUT_ONLY).
May be this code deserves more serious review, for example,
net/netfilter/nf_conntrack_proto_sctp.c looks as good
source for comparison.

	Anyways, this change looks correct to me,

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

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