[SRU Request] xfrm interface: fix oops when deleting a x-netns interface

[Nicolas Dichtel]

Hi Ubuntu kernel team,

please, could you consider to cherry-pick the linux upstream commit c95c5f58b35e
("xfrm interface: fix oops when deleting a x-netns interface"):

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c95c5f58b35e

It has been included in v5.7 (the bug exists since v4.19).

Here is the launchpad entry:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881907


Thank you,
Nicolas