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| author | Stefano Brivio <sbrivio@redhat.com> | 2019-03-08 16:40:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-19 13:13:23 +0100 |
| commit | 1ed2291ca6e2782d507f316abcbcb279828dcab7 (patch) | |
| tree | 3b7129d177b579d136205f56bd9a6c408e4bf237 | |
| parent | bb73b637993bd77087c0f3e56e86a040f230e435 (diff) | |
| download | linux-1ed2291ca6e2782d507f316abcbcb279828dcab7.tar.gz linux-1ed2291ca6e2782d507f316abcbcb279828dcab7.tar.bz2 linux-1ed2291ca6e2782d507f316abcbcb279828dcab7.zip | |
vxlan: Fix GRO cells race condition between receive and link delete
[ Upstream commit ad6c9986bcb627c7c22b8f9e9a934becc27df87c ]
If we receive a packet while deleting a VXLAN device, there's a chance
vxlan_rcv() is called at the same time as vxlan_dellink(). This is fine,
except that vxlan_dellink() should never ever touch stuff that's still in
use, such as the GRO cells list.
Otherwise, vxlan_rcv() crashes while queueing packets via
gro_cells_receive().
Move the gro_cells_destroy() to vxlan_uninit(), which runs after the RCU
grace period is elapsed and nothing needs the gro_cells anymore.
This is now done in the same way as commit 8e816df87997 ("geneve: Use GRO
cells infrastructure.") originally implemented for GENEVE.
Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: 58ce31cca1ff ("vxlan: GRO support at tunnel layer")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/vxlan.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index a1b40b9c4906..eb1c91e86fcd 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2462,6 +2462,8 @@ static void vxlan_uninit(struct net_device *dev) { struct vxlan_dev *vxlan = netdev_priv(dev); + gro_cells_destroy(&vxlan->gro_cells); + vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); free_percpu(dev->tstats); @@ -3523,7 +3525,6 @@ static void vxlan_dellink(struct net_device *dev, struct list_head *head) vxlan_flush(vxlan, true); - gro_cells_destroy(&vxlan->gro_cells); list_del(&vxlan->next); unregister_netdevice_queue(dev, head); } |