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bpf: move memory size checks to bpf_map_charge_init()

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Most bpf map types doing similar checks and bytes to pages
conversion during memory allocation and charging.

Let's unify these checks by moving them into bpf_map_charge_init().

Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Roman Gushchin
2019-05-29 18:03:59 -07:00
committed by Alexei Starovoitov
parent b936ca643a
commit c85d69135a
14 changed files with 20 additions and 67 deletions
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5
kernel/bpf/devmap.c
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@@ -108,12 +108,9 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
/* make sure page count doesn't overflow */
cost = (u64) dtab->map.max_entries * sizeof(struct bpf_dtab_netdev *);
cost += dev_map_bitmap_size(attr) * num_possible_cpus();
if (cost >= U32_MAX - PAGE_SIZE)
goto free_dtab;
/* if map size is larger than memlock limit, reject it */
err = bpf_map_charge_init(&dtab->map.memory,
round_up(cost, PAGE_SIZE) >> PAGE_SHIFT);
err = bpf_map_charge_init(&dtab->map.memory, cost);
if (err)
goto free_dtab;