]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
vxlan: Don't call gro_cells_destroy() before device is unregistered
authorZhiqiang Liu <liuzhiqiang26@huawei.com>
Sat, 16 Mar 2019 09:02:54 +0000 (17:02 +0800)
committerDavid S. Miller <davem@davemloft.net>
Tue, 19 Mar 2019 00:07:27 +0000 (17:07 -0700)
commitcc4807bb609230d8959fd732b0bf3bd4c2de8eac
tree97cbca43b015f1d37d89c5a2a4ffeccdaa75e19a
parenta7faaa0c5dc7d091cc9f72b870d7edcdd6f43f12
vxlan: Don't call gro_cells_destroy() before device is unregistered

Commit ad6c9986bcb62 ("vxlan: Fix GRO cells race condition between
receive and link delete") fixed a race condition for the typical case a vxlan
device is dismantled from the current netns. But if a netns is dismantled,
vxlan_destroy_tunnels() is called to schedule a unregister_netdevice_queue()
of all the vxlan tunnels that are related to this netns.

In vxlan_destroy_tunnels(), gro_cells_destroy() is called and finished before
unregister_netdevice_queue(). This means that the gro_cells_destroy() call is
done too soon, for the same reasons explained in above commit.

So we need to fully respect the RCU rules, and thus must remove the
gro_cells_destroy() call or risk use after-free.

Fixes: 58ce31cca1ff ("vxlan: GRO support at tunnel layer")
Signed-off-by: Suanming.Mou <mousuanming@huawei.com>
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/vxlan.c