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decnet: add RTNL lock when reading address list

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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>
This commit is contained in:
stephen hemminger 2009-11-11 07:39:27 +00:00 committed by David S. Miller
parent 08e9897d51
commit 41bdecf17e
1 changed files with 4 additions and 0 deletions
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4
net/decnet/dn_dev.c
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@ -828,13 +828,17 @@ static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
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;
}