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authorStephen Hemminger <shemminger@vyatta.com>2010-05-17 22:27:12 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-17 22:27:12 -0700
commiteedf042a63ffef050ebc015de19b52dc065e830b (patch)
treefe8a31b4ca2e36de74ce8c6b4ee66ac66deac6da /net/ipv6
parent820ae8a80eb59962aefbbd4908dfe144ec0f9edb (diff)
downloadlinux-2.6.34-ux500-eedf042a63ffef050ebc015de19b52dc065e830b.tar.gz
ipv6: fix the bug of address check
The duplicate address check code got broken in the conversion to hlist (2.6.35). The earlier patch did not fix the case where two addresses match same hash value. Use two exit paths, rather than depending on state of loop variables (from macro). Based on earlier fix by Shan Wei. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Reviewed-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/addrconf.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3984f52181f..75d3b8c1e85 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1274,7 +1274,7 @@ static int ipv6_count_addresses(struct inet6_dev *idev)
int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
struct net_device *dev, int strict)
{
- struct inet6_ifaddr *ifp = NULL;
+ struct inet6_ifaddr *ifp;
struct hlist_node *node;
unsigned int hash = ipv6_addr_hash(addr);
@@ -1283,15 +1283,16 @@ int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr) &&
- !(ifp->flags&IFA_F_TENTATIVE)) {
- if (dev == NULL || ifp->idev->dev == dev ||
- !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
- break;
+ !(ifp->flags&IFA_F_TENTATIVE) &&
+ (dev == NULL || ifp->idev->dev == dev ||
+ !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
+ rcu_read_unlock_bh();
+ return 1;
}
}
- rcu_read_unlock_bh();
- return ifp != NULL;
+ rcu_read_unlock_bh();
+ return 0;
}
EXPORT_SYMBOL(ipv6_chk_addr);