stable-request: bpf 2017-12-12

[Daniel Borkmann <daniel@xxxxxxxxxxxxx>]

Hi Greg,

It would be great if you could cherry-pick the following BPF related
commit into stable trees:

  c131187db2d3 ("bpf: fix branch pruning logic")  -  up to 4.9

  Instructions for 4.14:

    There's a minor conflict in verifier.c, just take the
    'env->insn_aux_data[insn_idx].seen = true;' part from
    the patch.

  Instructions for 4.9:

    Needs 8041902dae52 ("bpf: adjust insn_aux_data when patching
    insns") as prerequisite. Same minor conflict in verifier.c
    as with 4.14 described above. The minor one in bpf_verifier.h
    for struct bpf_insn_aux_data should be resolved by having
    'ptr_type' and 'seen' as final members of the struct.

Thanks a lot!