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bpf: use kvmemdup_bpfptr helper

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Use kvmemdup_bpfptr helper instead of open-coding to
simplify the code.

Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/1663058433-14089-1-git-send-email-wangyufen@huawei.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Wang Yufen 2022-09-13 16:40:33 +08:00 committed by Martin KaFai Lau
parent 47e34cb74d
commit a02c118ee9
1 changed files with 4 additions and 9 deletions
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13
kernel/bpf/syscall.c
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@ -1417,19 +1417,14 @@ static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr)
}
value_size = bpf_map_value_size(map);
err = -ENOMEM;
value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
if (!value)
value = kvmemdup_bpfptr(uvalue, value_size);
if (IS_ERR(value)) {
err = PTR_ERR(value);
goto free_key;
err = -EFAULT;
if (copy_from_bpfptr(value, uvalue, value_size) != 0)
goto free_value;
}
err = bpf_map_update_value(map, f, key, value, attr->flags);
free_value:
kvfree(value);
free_key:
kvfree(key);