From fe71f34fbf83d0de41e5725cc4988e238d452d11 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Tue, 9 Jan 2018 13:40:41 -0800 Subject: 8021q: fix a memory leak for VLAN 0 device [ Upstream commit 78bbb15f2239bc8e663aa20bbe1987c91a0b75f6 ] A vlan device with vid 0 is allow to creat by not able to be fully cleaned up by unregister_vlan_dev() which checks for vlan_id!=0. Also, VLAN 0 is probably not a valid number and it is kinda "reserved" for HW accelerating devices, but it is probably too late to reject it from creation even if makes sense. Instead, just remove the check in unregister_vlan_dev(). Reported-by: Dmitry Vyukov Fixes: ad1afb003939 ("vlan_dev: VLAN 0 should be treated as "no vlan tag" (802.1p packet)") Cc: Vlad Yasevich Cc: Ben Hutchings Signed-off-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/8021q/vlan.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) (limited to 'net') diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index 4a47074d1d7f..c8ea3cf9db85 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -111,12 +111,7 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head) 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->vlan_proto, vlan_id); + vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id); /* Get rid of the vlan's reference to real_dev */ dev_put(real_dev); -- cgit v1.2.3