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| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2015-09-30 20:16:54 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-01 18:24:05 -0700 |
| commit | 263344e64c0a2ac0e409a1a3f27effb6d57b853e (patch) | |
| tree | 1383a9017adcfb96767f49cd36f3adfc4357e188 /net/bridge/br_vlan.c | |
| parent | 77751ee8aec3e1748e0d1471ccbfc008793e88a6 (diff) | |
| download | linux-263344e64c0a2ac0e409a1a3f27effb6d57b853e.tar.gz linux-263344e64c0a2ac0e409a1a3f27effb6d57b853e.tar.bz2 linux-263344e64c0a2ac0e409a1a3f27effb6d57b853e.zip | |
bridge: vlan: fix possible null ptr derefs on port init and deinit
When a new port is being added we need to make vlgrp available after
rhashtable has been initialized and when removing a port we need to
flush the vlans and free the resources after we're sure noone can use
the port, i.e. after it's removed from the port list and synchronize_rcu
is executed.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_vlan.c')
| -rw-r--r-- | net/bridge/br_vlan.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 90ac4b0c55c1..7e9d60a402e2 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -854,16 +854,20 @@ err_rhtbl: int nbp_vlan_init(struct net_bridge_port *p) { + struct net_bridge_vlan_group *vg; int ret = -ENOMEM; - p->vlgrp = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL); - if (!p->vlgrp) + vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL); + if (!vg) goto out; - ret = rhashtable_init(&p->vlgrp->vlan_hash, &br_vlan_rht_params); + ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); if (ret) goto err_rhtbl; - INIT_LIST_HEAD(&p->vlgrp->vlan_list); + INIT_LIST_HEAD(&vg->vlan_list); + /* Make sure everything's committed before publishing vg */ + smp_wmb(); + p->vlgrp = vg; if (p->br->default_pvid) { ret = nbp_vlan_add(p, p->br->default_pvid, BRIDGE_VLAN_INFO_PVID | @@ -875,9 +879,9 @@ out: return ret; err_vlan_add: - rhashtable_destroy(&p->vlgrp->vlan_hash); + rhashtable_destroy(&vg->vlan_hash); err_rhtbl: - kfree(p->vlgrp); + kfree(vg); goto out; } |