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

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commit 4fdef69838 upstream.

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")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Yoshihiro Shimoda 2016-06-08 16:32:49 +09:00 • committed by Greg Kroah-Hartman

parent 3ab02b35d5

commit 97917f4521

1 changed files with 14 additions and 4 deletions

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drivers/usb/renesas_usbhs/fifo.c

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