usb: musb: host: fix potential NULL pointer dereference

BugLink: http://bugs.launchpad.net/bugs/1778759
commit 2b63f1329df2cd814c1f8353fae4853ace6521d1 upstream.

musb_start_urb() doesn't check the pass-in parameter if it is NULL.  But
in musb_bulk_nak_timeout() the parameter passed to musb_start_urb() is
returned from first_qh(), which could be NULL.

So wrap the musb_start_urb() call here with a if condition check to
avoid the potential NULL pointer dereference.

Fixes: f283862f3b5c ("usb: musb: NAK timeout scheme on bulk TX endpoint")
Cc: stable@vger.kernel.org # v3.7+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 6f311212f3c5ff87a58a9607403030c2202c1996..a1ccfcbbef5c3b41a9badc140108c518c489af72 100644 (file)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -998,7 +998,9 @@ static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
                        /* set tx_reinit and schedule the next qh */
                        ep->tx_reinit = 1;
                }
-               musb_start_urb(musb, is_in, next_qh);
+
+               if (next_qh)
+                       musb_start_urb(musb, is_in, next_qh);
        }
 }