[IPV4]: Fix setting broadcast for SIOCSIFNETMASK

Fix setting of the broadcast address when the netmask is set via
SIOCSIFNETMASK in Linux 2.6.  The code wanted the old value of
ifa->ifa_mask but used it after it had already been overwritten with
the new value.

Signed-off-by: David Engel <gigem@comcast.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 74f2207e131a..4ec4b2ca6ab1 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -715,6 +715,7 @@ int devinet_ioctl(unsigned int cmd, void __user *arg)
                         break;
                 ret = 0;
                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
+                        u32 old_mask = ifa->ifa_mask;
                         inet_del_ifa(in_dev, ifap, 0);
                         ifa->ifa_mask = sin->sin_addr.s_addr;
                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
@@ -728,7 +729,7 @@ int devinet_ioctl(unsigned int cmd, void __user *arg)
                         if ((dev->flags & IFF_BROADCAST) &&
                             (ifa->ifa_prefixlen < 31) &&
                             (ifa->ifa_broadcast ==
-                             (ifa->ifa_local|~ifa->ifa_mask))) {
+                             (ifa->ifa_local|~old_mask))) {
                                 ifa->ifa_broadcast = (ifa->ifa_local |
                                                       ~sin->sin_addr.s_addr);
                         }