On Wed, Jul 19, 2017 at 12:56 AM, Sabrina Dubroca <sd@xxxxxxxxxxxxxxx> wrote:
> When we delete a netns with a CLUSTERIP rule, clusterip_net_exit() is
> called first, removing /proc/net/ipt_CLUSTERIP.
> Then clusterip_config_entry_put() is called from clusterip_tg_destroy(),
> and tries to remove its entry under /proc/net/ipt_CLUSTERIP/.
>
> Fix this by checking that the parent directory of the entry to remove
> hasn't already been deleted.
>
> The following triggers a KASAN splat (stealing the reproducer from
> 202f59afd441, thanks to Jianlin Shi and Xin Long):
>
> ip netns add test
> ip link add veth0_in type veth peer name veth0_out
> ip link set veth0_in netns test
> ip netns exec test ip link set lo up
> ip netns exec test ip link set veth0_in up
> ip netns exec test iptables -I INPUT -d 1.2.3.4 -i veth0_in -j \
> CLUSTERIP --new --clustermac 89:d4:47:eb:9a:fa --total-nodes 3 \
> --local-node 1 --hashmode sourceip-sourceport
> ip netns del test
>
> Fixes: ce4ff76c15a8 ("netfilter: ipt_CLUSTERIP: make proc directory per net namespace")
> Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Reviewed-by: Xin Long <lucien.xin@xxxxxxxxx>
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