vxlan: do not destroy fdb if register_netdevice() is failed

__vxlan_dev_create() destroys FDB using specific pointer which indicates
a fdb when error occurs.
But that pointer should not be used when register_netdevice() fails because
register_netdevice() internally destroys fdb when error occurs.

This patch makes vxlan_fdb_create() to do not link fdb entry to vxlan dev
internally.
Instead, a new function vxlan_fdb_insert() is added to link fdb to vxlan
dev.

vxlan_fdb_insert() is called after calling register_netdevice().
This routine can avoid situation that ->ndo_uninit() destroys fdb entry
in error path of register_netdevice().
Hence, error path of __vxlan_dev_create() routine can have an opportunity
to destroy default fdb entry by hand.

Test command
    ip link add bonding_masters type vxlan id 0 group 239.1.1.1 \
	    dev enp0s9 dstport 4789

Splat looks like:
[  213.392816] kasan: GPF could be caused by NULL-ptr deref or user memory access
[  213.401257] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[  213.402178] CPU: 0 PID: 1414 Comm: ip Not tainted 5.2.0-rc5+ #256
[  213.402178] RIP: 0010:vxlan_fdb_destroy+0x120/0x220 [vxlan]
[  213.402178] Code: df 48 8b 2b 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 4c 8b 63 08 48 b8 00 00 00 00 00 fc d
[  213.402178] RSP: 0018:ffff88810cb9f0a0 EFLAGS: 00010202
[  213.402178] RAX: dffffc0000000000 RBX: ffff888101d4a8c8 RCX: 0000000000000000
[  213.402178] RDX: 1bd5a00000000040 RSI: ffff888101d4a8c8 RDI: ffff888101d4a8d0
[  213.402178] RBP: 0000000000000000 R08: fffffbfff22b72d9 R09: 0000000000000000
[  213.402178] R10: 00000000ffffffef R11: 0000000000000000 R12: dead000000000200
[  213.402178] R13: ffff88810cb9f1f8 R14: ffff88810efccda0 R15: ffff88810efccda0
[  213.402178] FS:  00007f7f6621a0c0(0000) GS:ffff88811b000000(0000) knlGS:0000000000000000
[  213.402178] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  213.402178] CR2: 000055746f0807d0 CR3: 00000001123e0000 CR4: 00000000001006f0
[  213.402178] Call Trace:
[  213.402178]  __vxlan_dev_create+0x3a9/0x7d0 [vxlan]
[  213.402178]  ? vxlan_changelink+0x740/0x740 [vxlan]
[  213.402178]  ? rcu_read_unlock+0x60/0x60 [vxlan]
[  213.402178]  ? __kasan_kmalloc.constprop.3+0xa0/0xd0
[  213.402178]  vxlan_newlink+0x8d/0xc0 [vxlan]
[  213.402178]  ? __vxlan_dev_create+0x7d0/0x7d0 [vxlan]
[  213.554119]  ? __netlink_ns_capable+0xc3/0xf0
[  213.554119]  __rtnl_newlink+0xb75/0x1180
[  213.554119]  ? rtnl_link_unregister+0x230/0x230
[ ... ]

Fixes: 0241b836732f ("vxlan: fix default fdb entry netlink notify ordering during netdev create")
Suggested-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 083f3f0bf37fd1cb8e8fcbf7265a70b5263c7283..b4283f52a09d135b32bc5bf4b193cfae63ded7ee 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -804,6 +804,14 @@ static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
        return f;
 }
 
+static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
+                            __be32 src_vni, struct vxlan_fdb *f)
+{
+       ++vxlan->addrcnt;
+       hlist_add_head_rcu(&f->hlist,
+                          vxlan_fdb_head(vxlan, mac, src_vni));
+}
+
 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
                            const u8 *mac, union vxlan_addr *ip,
                            __u16 state, __be16 port, __be32 src_vni,
@@ -829,18 +837,13 @@ static int vxlan_fdb_create(struct vxlan_dev *vxlan,
                return rc;
        }
 
-       ++vxlan->addrcnt;
-       hlist_add_head_rcu(&f->hlist,
-                          vxlan_fdb_head(vxlan, mac, src_vni));
-
        *fdb = f;
 
        return 0;
 }
 
-static void vxlan_fdb_free(struct rcu_head *head)
+static void __vxlan_fdb_free(struct vxlan_fdb *f)
 {
-       struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
        struct vxlan_rdst *rd, *nd;
 
        list_for_each_entry_safe(rd, nd, &f->remotes, list) {
@@ -850,6 +853,13 @@ static void vxlan_fdb_free(struct rcu_head *head)
        kfree(f);
 }
 
+static void vxlan_fdb_free(struct rcu_head *head)
+{
+       struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
+
+       __vxlan_fdb_free(f);
+}
+
 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
                              bool do_notify, bool swdev_notify)
 {
@@ -977,6 +987,7 @@ static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
        if (rc < 0)
                return rc;
 
+       vxlan_fdb_insert(vxlan, mac, src_vni, f);
        rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
                              swdev_notify, extack);
        if (rc)
@@ -3571,12 +3582,17 @@ static int __vxlan_dev_create(struct net *net, struct net_device *dev,
        if (err)
                goto errout;
 
-       /* notify default fdb entry */
        if (f) {
+               vxlan_fdb_insert(vxlan, all_zeros_mac,
+                                vxlan->default_dst.remote_vni, f);
+
+               /* notify default fdb entry */
                err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
                                       RTM_NEWNEIGH, true, extack);
-               if (err)
-                       goto errout;
+               if (err) {
+                       vxlan_fdb_destroy(vxlan, f, false, false);
+                       goto unregister;
+               }
        }
 
        list_add(&vxlan->next, &vn->vxlan_list);
@@ -3588,7 +3604,8 @@ errout:
         * destroy the entry by hand here.
         */
        if (f)
-               vxlan_fdb_destroy(vxlan, f, false, false);
+               __vxlan_fdb_free(f);
+unregister:
        if (unregister)
                unregister_netdevice(dev);
        return err;