diff options
author | Hristo Venev <hristo@venev.name> | 2021-04-12 20:41:16 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-21 14:00:57 +0300 |
commit | ea0340e632ba60030aa3eda422cdb90c9fe7983e (patch) | |
tree | 27b571feb91b9bc3e901d93f899c56187d654d2e /net | |
parent | 154ac84d497aa30459e39af4111dd45100759806 (diff) | |
download | linux-ea0340e632ba60030aa3eda422cdb90c9fe7983e.tar.xz |
net: sit: Unregister catch-all devices
commit 610f8c0fc8d46e0933955ce13af3d64484a4630a upstream.
A sit interface created without a local or a remote address is linked
into the `sit_net::tunnels_wc` list of its original namespace. When
deleting a network namespace, delete the devices that have been moved.
The following script triggers a null pointer dereference if devices
linked in a deleted `sit_net` remain:
for i in `seq 1 30`; do
ip netns add ns-test
ip netns exec ns-test ip link add dev veth0 type veth peer veth1
ip netns exec ns-test ip link add dev sit$i type sit dev veth0
ip netns exec ns-test ip link set dev sit$i netns $$
ip netns del ns-test
done
for i in `seq 1 30`; do
ip link del dev sit$i
done
Fixes: 5e6700b3bf98f ("sit: add support of x-netns")
Signed-off-by: Hristo Venev <hristo@venev.name>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r-- | net/ipv6/sit.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index b26f469a3fb8..146ba7fa5bf6 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1867,9 +1867,9 @@ static void __net_exit sit_destroy_tunnels(struct net *net, if (dev->rtnl_link_ops == &sit_link_ops) unregister_netdevice_queue(dev, head); - for (prio = 1; prio < 4; prio++) { + for (prio = 0; prio < 4; prio++) { int h; - for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { + for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { struct ip_tunnel *t; t = rtnl_dereference(sitn->tunnels[prio][h]); |