From: Johan Hovold <[email protected]>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 7e7797e7f6f7bfab73fca02c65e40eaa5bb9000c upstream.

Fix potential null-pointer exception on disconnect introduced by commit
11ea859d64b69a747d6b060b9ed1520eab1161fe (USB: additional power savings
for cdc-acm devices that support remote wakeup).

Only access acm->dev after making sure it is non-null in control urb
completion handler.

Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Paul Gortmaker <[email protected]>
---
 drivers/usb/class/cdc-acm.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index a45e6c4..073a9ef 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -297,6 +297,8 @@ static void acm_ctrl_irq(struct urb *urb)
        if (!ACM_READY(acm))
                goto exit;
 
+       usb_mark_last_busy(acm->dev);
+
        data = (unsigned char *)(dr + 1);
        switch (dr->bNotificationType) {
        case USB_CDC_NOTIFY_NETWORK_CONNECTION:
@@ -336,7 +338,6 @@ static void acm_ctrl_irq(struct urb *urb)
                break;
        }
 exit:
-       usb_mark_last_busy(acm->dev);
        retval = usb_submit_urb(urb, GFP_ATOMIC);
        if (retval)
                dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with "
-- 
1.7.4.4

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