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authorDaniel Borkmann <daniel@iogearbox.net>2018-02-16 03:10:29 +0300
committerAlexei Starovoitov <ast@kernel.org>2018-02-16 08:34:33 +0300
commit9c2d63b843a5c8a8d0559cc067b5398aa5ec3ffc (patch)
treec1696b8aa7d31d16a505006a102ca3381161c109 /drivers/net/ethernet/broadcom
parent67e3a172eba577f16ceae712d835b835b9718d61 (diff)
downloadlinux-9c2d63b843a5c8a8d0559cc067b5398aa5ec3ffc.tar.xz
bpf: fix mlock precharge on arraymaps
syzkaller recently triggered OOM during percpu map allocation; while there is work in progress by Dennis Zhou to add __GFP_NORETRY semantics for percpu allocator under pressure, there seems also a missing bpf_map_precharge_memlock() check in array map allocation. Given today the actual bpf_map_charge_memlock() happens after the find_and_alloc_map() in syscall path, the bpf_map_precharge_memlock() is there to bail out early before we go and do the map setup work when we find that we hit the limits anyway. Therefore add this for array map as well. Fixes: 6c9059817432 ("bpf: pre-allocate hash map elements") Fixes: a10423b87a7e ("bpf: introduce BPF_MAP_TYPE_PERCPU_ARRAY map") Reported-by: syzbot+adb03f3f0bb57ce3acda@syzkaller.appspotmail.com Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Dennis Zhou <dennisszhou@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/broadcom')
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