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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 from202f59afd4, 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:ce4ff76c15("netfilter: ipt_CLUSTERIP: make proc directory per net namespace") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Reviewed-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.