linux-kernel - [PATCH linux-next] ipvs: ip_vs_fill_iph_skb: Silence warning that 'iph.thoff

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Date:	Sun, 10 Mar 2013 09:09:05 -0600
From:	Tim Gardner <tim.gardner@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org
Subject: [PATCH linux-next] ipvs: ip_vs_fill_iph_skb: Silence warning that 'iph.thoff_reasm' may be used uninitialized

If CONFIG_IP_VS_IPV6 is not defined, then ip_vs_fill_iph_skb() does not
initialize all of the fields in struct ip_vs_iphdr. Silence the 'may be used
uninitialized' warning in the IPV4 only case by initializing the only field
that is unique to IPV6.

net/netfilter/ipvs/ip_vs_pe_sip.c: In function 'ip_vs_sip_fill_param':
net/netfilter/ipvs/ip_vs_pe_sip.c:87:11: warning: 'iph.thoff_reasm' may be used uninitialized in this function [-Wuninitialized]

gcc version 4.6.3

Also update comment to correctly reference fragoffs.

Cc: Wensong Zhang <wensong@...ux-vs.org>
Cc: Simon Horman <horms@...ge.net.au>
Cc: Julian Anastasov <ja@....bg>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org
Cc: lvs-devel@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 include/net/ip_vs.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 108ebe8..64ca32f 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -165,14 +165,16 @@ ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
 static inline void
 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
 {
+	/* May not get initialized in all cases */
+	iphdr->thoff_reasm = 0;
+
 #ifdef CONFIG_IP_VS_IPV6
 	if (af == AF_INET6) {
 		const struct ipv6hdr *iph =
 			(struct ipv6hdr *)skb_network_header(skb);
 		iphdr->saddr.in6 = iph->saddr;
 		iphdr->daddr.in6 = iph->daddr;
-		/* ipv6_find_hdr() updates len, flags, thoff_reasm */
-		iphdr->thoff_reasm = 0;
+		/* ipv6_find_hdr() updates len, flags, and fragoffs */
 		iphdr->len	 = 0;
 		iphdr->flags	 = 0;
 		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
-- 
1.7.9.5

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