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

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Message-Id: <1387127947-2075-1-git-send-email-hkchu@google.com>
Date:	Sun, 15 Dec 2013 09:19:07 -0800
From:	"H.K. Jerry Chu" <hkchu@...gle.com>
To:	hannes@...essinduktion.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Jerry Chu <hkchu@...gle.com>
Subject: [PATCH net-next] net-ipv6: Fix alleged compiler warning in ipv6_exthdrs_len()

From: Jerry Chu <hkchu@...gle.com>

It was reported that Commit 299603e8370a93dd5d8e8d800f0dff1ce2c53d36
("net-gro: Prepare GRO stack for the upcoming tunneling support")
triggered a compiler warning in ipv6_exthdrs_len():

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-u
    opth = (void *)opth + optlen;
    			^
    net/ipv6/ip6_offload.c:164:22: note: ‘optlen’ was declared here
    int len = 0, proto, optlen;
                        ^
Note that there was no real bug here - optlen was never uninitialized
before use. (Was the version of gcc I used smarter to not complain?)

Reported-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: H.K. Jerry Chu <hkchu@...gle.com>
---
 net/ipv6/ip6_offload.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 7540a0e..6fb4162 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -160,8 +160,8 @@ out:
 static int ipv6_exthdrs_len(struct ipv6hdr *iph,
 			    const struct net_offload **opps)
 {
-	struct ipv6_opt_hdr *opth = NULL;
-	int len = 0, proto, optlen;
+	struct ipv6_opt_hdr *opth = (void *)iph;
+	int len = 0, proto, optlen = sizeof(*iph);
 
 	proto = iph->nexthdr;
 	for (;;) {
@@ -172,10 +172,7 @@ static int ipv6_exthdrs_len(struct ipv6hdr *iph,
 			if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
 				break;
 		}
-		if (opth == NULL)
-			opth = (void *)(iph+1);
-		else
-			opth = (void *)opth + optlen;
+		opth = (void *)opth + optlen;
 		optlen = ipv6_optlen(opth);
 		len += optlen;
 		proto = opth->nexthdr;
-- 
1.8.5.1

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