linux-kernel - [PATCH] net: smc: fix error return code of smc_diag_dump

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Date:   Fri,  5 Mar 2021 02:13:51 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     kgraul@...ux.ibm.com, davem@...emloft.net, kuba@...nel.org
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] net: smc: fix error return code of smc_diag_dump_proto()

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 <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.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