decnet: add RTNL lock when reading address list
Add missing locking in the case of auto binding to the
default device. The address list might change while this code is looking
at the list.
Compile tested only, I am not a decnet user.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index b5ef237..5790d66 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -828,13 +828,17 @@
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
struct dn_ifaddr *ifa;
int rv = -ENODEV;
+
if (dn_db == NULL)
goto out;
+
+ rtnl_lock();
ifa = dn_db->ifa_list;
if (ifa != NULL) {
*addr = ifa->ifa_local;
rv = 0;
}
+ rtnl_unlock();
out:
return rv;
}