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    qmi_wwan: fix NULL deref on disconnect · bbae08e5
    Bjørn Mork 提交于
    qmi_wwan_disconnect is called twice when disconnecting devices with
    separate control and data interfaces.  The first invocation will set
    the interface data to NULL for both interfaces to flag that the
    disconnect has been handled.  But the matching NULL check was left
    out when qmi_wwan_disconnect was added, resulting in this oops:
    
      usb 2-1.4: USB disconnect, device number 4
      qmi_wwan 2-1.4:1.6 wwp0s29u1u4i6: unregister 'qmi_wwan' usb-0000:00:1d.0-1.4, WWAN/QMI device
      BUG: unable to handle kernel NULL pointer dereference at 00000000000000e0
      IP: qmi_wwan_disconnect+0x25/0xc0 [qmi_wwan]
      PGD 0
      P4D 0
      Oops: 0000 [#1] SMP
      Modules linked in: <stripped irrelevant module list>
      CPU: 2 PID: 33 Comm: kworker/2:1 Tainted: G            E   4.12.3-nr44-normandy-r1500619820+ #1
      Hardware name: LENOVO 4291LR7/4291LR7, BIOS CBET4000 4.6-810-g50522254fb 07/21/2017
      Workqueue: usb_hub_wq hub_event [usbcore]
      task: ffff8c882b716040 task.stack: ffffb8e800d84000
      RIP: 0010:qmi_wwan_disconnect+0x25/0xc0 [qmi_wwan]
      RSP: 0018:ffffb8e800d87b38 EFLAGS: 00010246
      RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
      RDX: 0000000000000001 RSI: ffff8c8824f3f1d0 RDI: ffff8c8824ef6400
      RBP: ffff8c8824ef6400 R08: 0000000000000000 R09: 0000000000000000
      R10: ffffb8e800d87780 R11: 0000000000000011 R12: ffffffffc07ea0e8
      R13: ffff8c8824e2e000 R14: ffff8c8824e2e098 R15: 0000000000000000
      FS:  0000000000000000(0000) GS:ffff8c8835300000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00000000000000e0 CR3: 0000000229ca5000 CR4: 00000000000406e0
      Call Trace:
       ? usb_unbind_interface+0x71/0x270 [usbcore]
       ? device_release_driver_internal+0x154/0x210
       ? qmi_wwan_unbind+0x6d/0xc0 [qmi_wwan]
       ? usbnet_disconnect+0x6c/0xf0 [usbnet]
       ? qmi_wwan_disconnect+0x87/0xc0 [qmi_wwan]
       ? usb_unbind_interface+0x71/0x270 [usbcore]
       ? device_release_driver_internal+0x154/0x210
    Reported-and-tested-by: NNathaniel Roach <nroach44@gmail.com>
    Fixes: c6adf779 ("net: usb: qmi_wwan: add qmap mux protocol support")
    Cc: Daniele Palmas <dnlplm@gmail.com>
    Signed-off-by: NBjørn Mork <bjorn@mork.no>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    bbae08e5
qmi_wwan.c 46.6 KB