From 3e81c6da39a265e11ef48f52bd15bf7ca0068c75 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 20 Mar 2010 16:18:00 -0700 Subject: [PATCH] ipv6: Fix bug in ipv6_chk_same_addr(). hlist_for_each_entry(p...) will not necessarily initialize 'p' to anything if the hlist is empty. GCC notices this and emits a warning. Just return true explicitly when we hit a match, and return false is we fall out of the loop without one. Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 7d7d4b17c0f0..68e5809a2153 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -155,8 +155,8 @@ static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); static void inet6_prefix_notify(int event, struct inet6_dev *idev, struct prefix_info *pinfo); -static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, - struct net_device *dev); +static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, + struct net_device *dev); static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); @@ -1295,23 +1295,22 @@ int ipv6_chk_addr(struct net *net, struct in6_addr *addr, } EXPORT_SYMBOL(ipv6_chk_addr); -static -int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, - struct net_device *dev) +static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, + struct net_device *dev) { + unsigned int hash = ipv6_addr_hash(addr); struct inet6_ifaddr *ifp; struct hlist_node *node; - unsigned int hash = ipv6_addr_hash(addr); hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { if (!net_eq(dev_net(ifp->idev->dev), net)) continue; if (ipv6_addr_equal(&ifp->addr, addr)) { if (dev == NULL || ifp->idev->dev == dev) - break; + return true; } } - return ifp != NULL; + return false; } int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev) -- 2.20.1