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 <davem@davemloft.net>

1 files 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)