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

Daniel Borkmann says:

====================
pull-request: bpf 2018-05-18

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) Fix two bugs in sockmap, a use after free in sockmap's error path
   from sock_map_ctx_update_elem() where we mistakenly drop a reference
   we didn't take prior to that, and in the same function fix a race
   in bpf_prog_inc_not_zero() where we didn't use the progs from prior
   READ_ONCE(), from John.

2) Reject program expansions once we figure out that their jump target
   which crosses patchlet boundaries could otherwise get truncated in
   insn->off space, from Daniel.

3) Check the return value of fopen() in BPF selftest's test_verifier
   where we determine whether unpriv BPF is disabled, and iff we do
   fail there then just assume it is disabled. This fixes a segfault
   when used with older kernels, from Jesper.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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