tree 5fcefc535a800b6b95f4080669183ebd27a224f5
parent 6170a93fa0fa3dc59affe9d90af940d240228523
author Jason A. Donenfeld <Jason@zx2c4.com> 1592906385 -0600
committer Michael Bestas <mkbestas@lineageos.org> 1616458171 +0200

UPSTREAM: wireguard: device: avoid circular netns references

Before, we took a reference to the creating netns if the new netns was
different. This caused issues with circular references, with two
wireguard interfaces swapping namespaces. The solution is to rather not
take any extra references at all, but instead simply invalidate the
creating netns pointer when that netns is deleted.

In order to prevent this from happening again, this commit improves the
rough object leak tracking by allowing it to account for created and
destroyed interfaces, aside from just peers and keys. That then makes it
possible to check for the object leak when having two interfaces take a
reference to each others' namespaces.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 900575aa33a3eaaef802b31de187a85c4a4b4bd0)
Bug: 152722841
[Jason: netlink notifier uses exit instead of pre_exit]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iea52fe3ca0e41318c392d9e91edb1856de6c9528