Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2020-11-28

1) Do not reference the skb for xsk's generic TX side since when looped
   back into RX it might crash in generic XDP, from Björn Töpel.

2) Fix umem cleanup on a partially set up xsk socket when being destroyed,
   from Magnus Karlsson.

3) Fix an incorrect netdev reference count when failing xsk_bind() operation,
   from Marek Majtyka.

4) Fix bpftool to set an error code on failed calloc() in build_btf_type_table(),
   from Zhen Lei.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf: Add MAINTAINERS entry for BPF LSM
  bpftool: Fix error return value in build_btf_type_table
  net, xsk: Avoid taking multiple skbuff references
  xsk: Fix incorrect netdev reference count
  xsk: Fix umem cleanup bug at socket destruct
  MAINTAINERS: Update XDP and AF_XDP entries
====================

Link: https://lore.kernel.org/r/20201128005104.1205-1-daniel@iogearbox.net


Signed-off-by: Jakub Kicinski <kuba@kernel.org>