net: bridge: vlan: fix error return code in __vlan_add()

stable inclusion
from linux-4.19.164
commit e64cc462703f209ff0db62e5c75b7019df0cac97

--------------------------------

[ Upstream commit ee4f52a8 ]

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: f8ed289f ("bridge: vlan: use br_vlan_(get|put)_master to deal with refcounts")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: NNikolay Aleksandrov <nikolay@nvidia.com>
Link: https://lore.kernel.org/r/1607071737-33875-1-git-send-email-zhangchangzhong@huawei.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>

net/bridge/br_vlan.c

@@ -242,8 +242,10 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 		}
 
 		masterv = br_vlan_get_master(br, v->vid);
-		if (!masterv)
+		if (!masterv) {
+			err = -ENOMEM;
 			goto out_filt;
+		}
 		v->brvlan = masterv;
 		v->stats = masterv->stats;
 	} else {