[PATCH net v2] ipv6: addrlabel: fix possible memory leak in ip6addrlbl_net_init

[Wang Hai]

kmemleak report a memory leak as follows:

unreferenced object 0xffff8880059c6a00 (size 64):
  comm "ip", pid 23696, jiffies 4296590183 (age 1755.384s)
  hex dump (first 32 bytes):
    20 01 00 10 00 00 00 00 00 00 00 00 00 00 00 00   ...............
    1c 00 00 00 00 00 00 00 00 00 00 00 07 00 00 00  ................
  backtrace:
    [<00000000aa4e7a87>] ip6addrlbl_add+0x90/0xbb0
    [<0000000070b8d7f1>] ip6addrlbl_net_init+0x109/0x170
    [<000000006a9ca9d4>] ops_init+0xa8/0x3c0
    [<000000002da57bf2>] setup_net+0x2de/0x7e0
    [<000000004e52d573>] copy_net_ns+0x27d/0x530
    [<00000000b07ae2b4>] create_new_namespaces+0x382/0xa30
    [<000000003b76d36f>] unshare_nsproxy_namespaces+0xa1/0x1d0
    [<0000000030653721>] ksys_unshare+0x3a4/0x780
    [<0000000007e82e40>] __x64_sys_unshare+0x2d/0x40
    [<0000000031a10c08>] do_syscall_64+0x33/0x40
    [<0000000099df30e7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

We should free all rules when we catch an error in ip6addrlbl_net_init().
otherwise a memory leak will occur.

Fixes: 2a8cc6c89039 ("[IPV6] ADDRCONF: Support RFC3484 configurable address 
selection policy table.")
Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Wang Hai <wangha...@huawei.com>
---
v1->v2: simplify this function
 net/ipv6/addrlabel.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index 642fc6ac13d2..8a22486cf270 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -306,7 +306,9 @@ static int ip6addrlbl_del(struct net *net,
 /* add default label */
 static int __net_init ip6addrlbl_net_init(struct net *net)
 {
-       int err = 0;
+       struct ip6addrlbl_entry *p = NULL;
+       struct hlist_node *n;
+       int err;
        int i;
 
        ADDRLABEL(KERN_DEBUG "%s\n", __func__);
@@ -315,14 +317,20 @@ static int __net_init ip6addrlbl_net_init(struct net *net)
        INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head);
 
        for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
-               int ret = ip6addrlbl_add(net,
-                                        ip6addrlbl_init_table[i].prefix,
-                                        ip6addrlbl_init_table[i].prefixlen,
-                                        0,
-                                        ip6addrlbl_init_table[i].label, 0);
-               /* XXX: should we free all rules when we catch an error? */
-               if (ret && (!err || err != -ENOMEM))
-                       err = ret;
+               err = ip6addrlbl_add(net,
+                                    ip6addrlbl_init_table[i].prefix,
+                                    ip6addrlbl_init_table[i].prefixlen,
+                                    0,
+                                    ip6addrlbl_init_table[i].label, 0);
+               if (err)
+                       goto err_ip6addrlbl_add;
+       }
+       return 0;
+
+err_ip6addrlbl_add:
+       hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) 
{
+               hlist_del_rcu(&p->list);
+               kfree_rcu(p, rcu);
        }
        return err;
 }
-- 
2.17.1