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| author | Stefano Brivio <sbrivio@redhat.com> | 2019-03-08 16:40:57 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-03-08 11:27:21 -0800 |
| commit | ad6c9986bcb627c7c22b8f9e9a934becc27df87c (patch) | |
| tree | 5056ffd00fa5c22c0d80b8f65e432f21af5db59f /drivers/net | |
| parent | 930c9f9125c85b5134b3e711bc252ecc094708e3 (diff) | |
| download | linux-ad6c9986bcb627c7c22b8f9e9a934becc27df87c.tar.gz linux-ad6c9986bcb627c7c22b8f9e9a934becc27df87c.tar.bz2 linux-ad6c9986bcb627c7c22b8f9e9a934becc27df87c.zip | |
vxlan: Fix GRO cells race condition between receive and link delete
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>
Diffstat (limited to 'drivers/net')
| -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 a3c46d78d216..76abd31e8d56 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2767,6 +2767,8 @@ 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); @@ -3942,7 +3944,6 @@ 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); } |