dlci: validate the net device in dlci_del()

We triggered an oops while running trinity with 3.4 kernel:

BUG: unable to handle kernel paging request at 0000000100000d07
IP: [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
PGD 640c0d067 PUD 0
Oops: 0000 [#1] PREEMPT SMP
CPU 3
...
Pid: 7302, comm: trinity-child3 Not tainted 3.4.24.09+ 40 Huawei Technologies Co., Ltd. Tecal RH2285          /BC11BTSA
RIP: 0010:[<ffffffffa0109738>]  [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
...
Call Trace:
  [<ffffffff8137c5c3>] sock_ioctl+0x153/0x280
  [<ffffffff81195494>] do_vfs_ioctl+0xa4/0x5e0
  [<ffffffff8118354a>] ? fget_light+0x3ea/0x490
  [<ffffffff81195a1f>] sys_ioctl+0x4f/0x80
  [<ffffffff81478b69>] system_call_fastpath+0x16/0x1b
...

It's because the net device is not a dlci device.

Reported-by: Li Jinyue <lijinyue@huawei.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
index 1f6e0538c716..6a8a382c5f4c 100644
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -384,6 +384,7 @@ static int dlci_del(struct dlci_add *dlci)
         struct frad_local       *flp;
         struct net_device       *master, *slave;
         int                     err;
+        bool                    found = false;
 
         rtnl_lock();
 
@@ -394,6 +395,17 @@ static int dlci_del(struct dlci_add *dlci)
                 goto out;
         }
 
+        list_for_each_entry(dlp, &dlci_devs, list) {
+                if (dlp->master == master) {
+                        found = true;
+                        break;
+                }
+        }
+        if (!found) {
+                err = -ENODEV;
+                goto out;
+        }
+
         if (netif_running(master)) {
                 err = -EBUSY;
                 goto out;