ipv6/sit: fix ipip6_tunnel_get_prl return value

commit adabdd8f6acabc0c3fdbba2e7f5a2edd9c5ef22d upstream.

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@tencent.com>
Reviewed-by: Eric Dumazet<edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220628035030.1039171-1-zys.zljxml@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 626cb53..637cd99 100644 (file)
--- 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 @@ out:
                ret = -EFAULT;
 
        kfree(kp);
-
+out:
        return ret;
 }