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ipv6: Fix bug in ipv6_chk_same_addr().

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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>
This commit is contained in:
David S. Miller 2010-03-20 16:18:00 -07:00
parent b2db756449
commit 3e81c6da39
1 changed files with 7 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

11
net/ipv6/addrconf.c
View file

@ -155,7 +155,7 @@ static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static void inet6_prefix_notify(int event, struct inet6_dev *idev, static void inet6_prefix_notify(int event, struct inet6_dev *idev,
struct prefix_info *pinfo); struct prefix_info *pinfo);
static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev); struct net_device *dev);
static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 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); EXPORT_SYMBOL(ipv6_chk_addr);
static static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev) struct net_device *dev)
{ {
unsigned int hash = ipv6_addr_hash(addr);
struct inet6_ifaddr *ifp; struct inet6_ifaddr *ifp;
struct hlist_node *node; struct hlist_node *node;
unsigned int hash = ipv6_addr_hash(addr);
hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net)) if (!net_eq(dev_net(ifp->idev->dev), net))
continue; continue;
if (ipv6_addr_equal(&ifp->addr, addr)) { if (ipv6_addr_equal(&ifp->addr, addr)) {
if (dev == NULL || ifp->idev->dev == dev) 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) int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)