xfrm interface: several kernel panic

[Nicolas Dichtel]

Hi Ubuntu kernel team,

please, can you consider to cherry-pick the following linux upstream fixes:
56c5ee1a5823 ("xfrm interface: fix memory leak on creation")
e9e7e85d75f3 ("xfrm interface: avoid corruption on changelink")
e0aaa332e6a9 ("xfrm interface: ifname may be wrong in logs")
c5d1030f2300 ("xfrm interface: fix list corruption for x-netns")
22d6552f827e ("xfrm interface: fix management of phydev")

They have been included in v5.3 and the patch that introduces the bug has been
pushed in v4.19.

Here is the launchpad entry:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1836261


Thank you,
Nicolas