netdev - [PATCH net-next] ipv6: fix compiler warning in ipv6_exthdrs

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Message-ID: <20131214062929.GA23563@order.stressinduktion.org>
Date:	Sat, 14 Dec 2013 07:29:29 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"H.K. Jerry Chu" <hkchu@...gle.com>
Cc:	edumazet@...gle.com, herbert@...dor.apana.org.au,
	ogerlitz@...lanox.com, bhutchings@...arflare.com,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH net-next] ipv6: fix compiler warning in ipv6_exthdrs_len

Commit 299603e8370a93dd5d8e8d800f0dff1ce2c53d36 ("net-gro: Prepare GRO
stack for the upcoming tunneling support") used an uninitialized variable
which leads to the following compiler warning:

net/ipv6/ip6_offload.c: In function ‘ipv6_gro_complete’:
net/ipv6/ip6_offload.c:178:24: warning: ‘optlen’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    opth = (void *)opth + optlen;
                        ^
net/ipv6/ip6_offload.c:164:22: note: ‘optlen’ was declared here
  int len = 0, proto, optlen;
                      ^
Fix it up.

Cc: Jerry Chu <hkchu@...gle.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---

I just noticed this and tried to fix it. Jerry, could you please review?
I hope I got it right. ;)

 net/ipv6/ip6_offload.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 7540a0e..08861f1 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -161,7 +161,7 @@ static int ipv6_exthdrs_len(struct ipv6hdr *iph,
 			    const struct net_offload **opps)
 {
 	struct ipv6_opt_hdr *opth = NULL;
-	int len = 0, proto, optlen;
+	int len = 0, optlen = 0, proto;
 
 	proto = iph->nexthdr;
 	for (;;) {
@@ -172,11 +172,12 @@ static int ipv6_exthdrs_len(struct ipv6hdr *iph,
 			if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
 				break;
 		}
-		if (opth == NULL)
+		if (opth == NULL) {
 			opth = (void *)(iph+1);
-		else
+		} else {
+			optlen = ipv6_optlen(opth);
 			opth = (void *)opth + optlen;
-		optlen = ipv6_optlen(opth);
+		}
 		len += optlen;
 		proto = opth->nexthdr;
 	}
-- 
1.8.3.1

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