[PATCH -next] bpf: fix error return code in map_lookup_and_delete_elem()

[Wei Yongjun]

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 <weiyongj...@huawei.com>
---
 kernel/bpf/syscall.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 3cea7602de78..68c22e9420fa 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1492,8 +1492,10 @@ 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;