[PATCH] net: smc: fix error return code of smc_diag_dump_proto()

[Jia-Ju Bai]

When the list of head is empty, no error return code of
smc_diag_dump_proto() is assigned.
To fix this bug, rc is assigned with -ENOENT as error return code.

Reported-by: TOTE Robot <os...@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
 net/smc/smc_diag.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_diag.c b/net/smc/smc_diag.c
index c952986a6aca..a90889482842 100644
--- a/net/smc/smc_diag.c
+++ b/net/smc/smc_diag.c
@@ -201,8 +201,10 @@ static int smc_diag_dump_proto(struct proto *prot, struct 
sk_buff *skb,
 
        read_lock(&prot->h.smc_hash->lock);
        head = &prot->h.smc_hash->ht;
-       if (hlist_empty(head))
+       if (hlist_empty(head)) {
+               rc = -ENOENT;
                goto out;
+       }
 
        sk_for_each(sk, head) {
                if (!net_eq(sock_net(sk), net))
-- 
2.17.1