The fix is available in commit:
commit 0152eee6fc3b84298bb6a79961961734e8afa5b8
Author: Steffen Klassert <email address hidden>
Date: Thu Nov 22 07:26:24 2018 +0100
xfrm: Fix NULL pointer dereference in xfrm_input when skb_dst_force clea
rs the dst_entry.
The fix is available in commit: 98bb6a799619617 34e8afa5b8
commit 0152eee6fc3b842
Author: Steffen Klassert <email address hidden>
Date: Thu Nov 22 07:26:24 2018 +0100
xfrm: Fix NULL pointer dereference in xfrm_input when skb_dst_force clea
rs the dst_entry.
Could be nice to backport this one.