tree 71ab6bc0dde6d51479bd0df3284fdc5054184f6c
parent 44963d649da63ce8ed8f41b8a267c745ca1ec0b0
author Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> 1465371169 +0900
committer Felipe Balbi <felipe.balbi@linux.intel.com> 1467188073 +0300

usb: renesas_usbhs: fix NULL pointer dereference in xfer_work()

This patch fixes an issue that the xfer_work() is possible to cause
NULL pointer dereference if the usb cable is disconnected while data
transfer is running.

In such case, a gadget driver may call usb_ep_disable()) before
xfer_work() is actually called. In this case, the usbhs_pkt_pop()
will call usbhsf_fifo_unselect(), and then usbhs_pipe_to_fifo()
in xfer_work() will return NULL.

Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>