linux-kernel - [PATCH v3] ipv6/sit: fix ipip6_tunnel_get

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Message-Id: <20220628035030.1039171-1-zys.zljxml@gmail.com>
Date:   Tue, 28 Jun 2022 11:50:30 +0800
From:   zys.zljxml@...il.com
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        yoshfuji@...ux-ipv6.org
Cc:     dsahern@...nel.org, kuba@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, eric.dumazet@...il.com, pabeni@...hat.com,
        katrinzhou <katrinzhou@...cent.com>
Subject: [PATCH v3] ipv6/sit: fix ipip6_tunnel_get_prl return value

From: katrinzhou <katrinzhou@...cent.com>

When kcalloc fails, ipip6_tunnel_get_prl() should return -ENOMEM.
Move the position of label "out" to return correctly.

Addresses-Coverity: ("Unused value")
Fixes: 300aaeeaab5f ("[IPV6] SIT: Add SIOCGETPRL ioctl to get/dump PRL.")
Signed-off-by: katrinzhou <katrinzhou@...cent.com>
---

Changes in v2:
- Move the position of label "out"

Changes in v3:
- Modify commit message

 net/ipv6/sit.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index c0b138c20992..6bcd5e419a08 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -323,8 +323,6 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) :
 		NULL;
 
-	rcu_read_lock();
-
 	ca = min(t->prl_count, cmax);
 
 	if (!kp) {
@@ -341,7 +339,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		}
 	}
 
-	c = 0;
+	rcu_read_lock();
 	for_each_prl_rcu(t->prl) {
 		if (c >= cmax)
 			break;
@@ -353,7 +351,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		if (kprl.addr != htonl(INADDR_ANY))
 			break;
 	}
-out:
+
 	rcu_read_unlock();
 
 	len = sizeof(*kp) * c;
@@ -362,7 +360,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		ret = -EFAULT;
 
 	kfree(kp);
-
+out:
 	return ret;
 }
 
-- 
2.27.0