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bpf: Fix error return code in map_lookup_and_delete_elem()

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Fix to return negative error code -EFAULT from the copy_to_user() error
handling case instead of 0, as done elsewhere in this function.

Fixes: bd513cd08f10 ("bpf: add MAP_LOOKUP_AND_DELETE_ELEM syscall")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200430081851.166996-1-weiyongjun1@huawei.com
This commit is contained in:
Wei Yongjun 2020-04-30 08:18:51 +00:00 committed by Daniel Borkmann
parent 18f02ad19e
commit 7f645462ca
1 changed files with 3 additions and 1 deletions
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4
kernel/bpf/syscall.c
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@ -1485,8 +1485,10 @@ static int map_lookup_and_delete_elem(union bpf_attr *attr)
if (err)
goto free_value;
if (copy_to_user(uvalue, value, value_size) != 0)
if (copy_to_user(uvalue, value, value_size) != 0) {
err = -EFAULT;
goto free_value;
}
err = 0;