net: cdc_mbim: __vlan_find_dev_deep need rcu_read_lock

Fixes this warning introduced by commit 5b8f15f78e6f
("net: cdc_mbim: handle IPv6 Neigbor Solicitations"):

===============================
[ INFO: suspicious RCU usage. ]
3.15.0-rc3 #213 Tainted: G        W  O
-------------------------------
net/8021q/vlan_core.c:69 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 1
no locks held by ksoftirqd/0/3.

stack backtrace:
CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G        W  O  3.15.0-rc3 #213
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
 0000000000000001 ffff880232533bf0 ffffffff813a5ee6 0000000000000006
 ffff880232530090 ffff880232533c20 ffffffff81076b94 0000000000000081
 0000000000000000 ffff8802085ac000 ffff88007fc8ea00 ffff880232533c50
Call Trace:
 [<ffffffff813a5ee6>] dump_stack+0x4e/0x68
 [<ffffffff81076b94>] lockdep_rcu_suspicious+0xfa/0x103
 [<ffffffff813978a6>] __vlan_find_dev_deep+0x54/0x94
 [<ffffffffa04a1938>] cdc_mbim_rx_fixup+0x379/0x66a [cdc_mbim]
 [<ffffffff813ab76f>] ? _raw_spin_unlock_irqrestore+0x3a/0x49
 [<ffffffff81079671>] ? trace_hardirqs_on_caller+0x192/0x1a1
 [<ffffffffa059bd10>] usbnet_bh+0x59/0x287 [usbnet]
 [<ffffffff8104067d>] tasklet_action+0xbb/0xcd
 [<ffffffff81040057>] __do_softirq+0x14c/0x30d
 [<ffffffff81040237>] run_ksoftirqd+0x1f/0x50
 [<ffffffff8105f13e>] smpboot_thread_fn+0x172/0x18e
 [<ffffffff8105efcc>] ? SyS_setgroups+0xdf/0xdf
 [<ffffffff810594b0>] kthread+0xb5/0xbd
 [<ffffffff813a84b1>] ? __wait_for_common+0x13b/0x170
 [<ffffffff810593fb>] ? __kthread_parkme+0x5c/0x5c
 [<ffffffff813b147c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810593fb>] ? __kthread_parkme+0x5c/0x5c

Fixes: 5b8f15f78e6f ("net: cdc_mbim: handle IPv6 Neigbor Solicitations")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c
index c9f3281506af..13f7705fd679 100644
--- a/drivers/net/usb/cdc_mbim.c
+++ b/drivers/net/usb/cdc_mbim.c
@@ -204,17 +204,23 @@ static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
                 return;
 
         /* need to send the NA on the VLAN dev, if any */
-        if (tci)
+        rcu_read_lock();
+        if (tci) {
                 netdev = __vlan_find_dev_deep(dev->net, htons(ETH_P_8021Q),
                                               tci);
-        else
+                if (!netdev) {
+                        rcu_read_unlock();
+                        return;
+                }
+        } else {
                 netdev = dev->net;
-        if (!netdev)
-                return;
+        }
+        dev_hold(netdev);
+        rcu_read_unlock();
 
         in6_dev = in6_dev_get(netdev);
         if (!in6_dev)
-                return;
+                goto out;
         is_router = !!in6_dev->cnf.forwarding;
         in6_dev_put(in6_dev);
 
@@ -224,6 +230,8 @@ static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
                                  true /* solicited */,
                                  false /* override */,
                                  true /* inc_opt */);
+out:
+        dev_put(netdev);
 }
 
 static bool is_neigh_solicit(u8 *buf, size_t len)