[PATCH 4.4 151/162] batman-adv: Prevent duplicated softif_vlan entry

Greg Kroah-Hartman
2021-11-24T12:11:55Z

From: Sven Eckelmann <sven@narfation.org>

commit 94cb82f594ed86be303398d6dfc7640a6f1d45d4 upstream.

The function batadv_softif_vlan_get is responsible for adding new
softif_vlan to the softif_vlan_list. It first checks whether the entry
already is in the list or not. If it is, then the creation of a new entry
is aborted.

But the lock for the list is only held when the list is really modified.
This could lead to duplicated entries because another context could create
an entry with the same key between the check and the list manipulation.

The check and the manipulation of the list must therefore be in the same
locked code section.

Fixes: 5d2c05b21337 ("batman-adv: add per VLAN interface attribute framework")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
[ bp: 4.4 backport: switch back to atomic_t based reference counting. ]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/batman-adv/soft-interface.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -539,15 +539,20 @@ int batadv_softif_create_vlan(struct bat
struct batadv_softif_vlan *vlan;
int err;

+ spin_lock_bh(&bat_priv->softif_vlan_list_lock);
+
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (vlan) {
batadv_softif_vlan_free_ref(vlan);
+ spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
return -EEXIST;
}

vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
- if (!vlan)
+ if (!vlan) {
+ spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
return -ENOMEM;
+ }

vlan->bat_priv = bat_priv;
vlan->vid = vid;
@@ -555,16 +560,19 @@ int batadv_softif_create_vlan(struct bat

atomic_set(&vlan->ap_isolation, 0);

+ hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
+ spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+
+ /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
+ * sleeping behavior of the sysfs functions and the fs_reclaim lock
+ */
err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
if (err) {
- kfree(vlan);
+ /* ref for the list */
+ batadv_softif_vlan_free_ref(vlan);
return err;
}

- spin_lock_bh(&bat_priv->softif_vlan_list_lock);
- hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
- spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
-
/* add a new TT local entry. This one will be marked with the NOPURGE
* flag
*/