devmap: Use bpf_map_area_alloc() for allocating hash buckets
[ Upstream commit 99c51064 ] Syzkaller discovered that creating a hash of type devmap_hash with a large number of entries can hit the memory allocator limit for allocating contiguous memory regions. There's really no reason to use kmalloc_array() directly in the devmap code, so just switch it to the existing bpf_map_area_alloc() function that is used elsewhere. Fixes: 6f9d451a ("xdp: Add devmap_hash map type for looking up devices by hashed index") Reported-by:Xiumei Mu <xmu@redhat.com> Signed-off-by:
Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20200616142829.114173-1-toke@redhat.com Signed-off-by:
Sasha Levin <sashal@kernel.org>
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