2013-04-11 21:21:36

by Steven Rostedt

[permalink] [raw]
Subject: [ 151/171 ] 8021q: fix a potential use-after-free

3.6.11.2 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Cong Wang <[email protected]>

[ Upstream commit 4a7df340ed1bac190c124c1601bfc10cde9fb4fb ]

vlan_vid_del() could possibly free ->vlan_info after a RCU grace
period, however, we may still refer to the freed memory area
by 'grp' pointer. Found by code inspection.

This patch moves vlan_vid_del() as behind as possible.

Cc: Patrick McHardy <[email protected]>
Cc: "David S. Miller" <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
---
net/8021q/vlan.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 9096bcb..8bdc56d 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -86,13 +86,6 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)

grp = &vlan_info->grp;

- /* Take it out of our own structures, but be sure to interlock with
- * HW accelerating devices or SW vlan input packet processing if
- * VLAN is not 0 (leave it there for 802.1p).
- */
- if (vlan_id)
- vlan_vid_del(real_dev, vlan_id);
-
grp->nr_vlan_devs--;

if (vlan->flags & VLAN_FLAG_GVRP)
@@ -108,6 +101,13 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
if (grp->nr_vlan_devs == 0)
vlan_gvrp_uninit_applicant(real_dev);

+ /* Take it out of our own structures, but be sure to interlock with
+ * HW accelerating devices or SW vlan input packet processing if
+ * VLAN is not 0 (leave it there for 802.1p).
+ */
+ if (vlan_id)
+ vlan_vid_del(real_dev, vlan_id);
+
/* Get rid of the vlan's reference to real_dev */
dev_put(real_dev);
}
--
1.7.10.4