Patch "usb: chipidea: host: fix NULL ptr dereference during shutdown" has been added to the 4.8-stable tree

Patch "usb: chipidea: host: fix NULL ptr dereference during shutdown" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: chipidea: host: fix NULL ptr dereference during shutdown

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-chipidea-host-fix-null-ptr-dereference-during-shutdown.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 991d5add50a5bb6ab8f12f2129f5c7487f6baaf6 Mon Sep 17 00:00:00 2001
From: Stefan Wahren <stefan.wahren@i2se.com>
Date: Sat, 10 Sep 2016 12:53:21 +0000
Subject: usb: chipidea: host: fix NULL ptr dereference during shutdown

From: Stefan Wahren <stefan.wahren@i2se.com>

commit 991d5add50a5bb6ab8f12f2129f5c7487f6baaf6 upstream.

After commit b09b5224fe86 ("usb: chipidea: implement platform shutdown
callback") and commit 43a404577a93 ("usb: chipidea: host: set host to
be null after hcd is freed") a NULL pointer dereference is caused
on i.MX23 during shutdown. So ensure that role is set to CI_ROLE_END and
we finish interrupt handling before the hcd is deallocated. This avoids
the NULL pointer dereference.

Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: b09b5224fe86 ("usb: chipidea: implement platform shutdown callback")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/chipidea/host.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -185,6 +185,8 @@ static void host_stop(struct ci_hdrc *ci
 
 	if (hcd) {
 		usb_remove_hcd(hcd);
+		ci->role = CI_ROLE_END;
+		synchronize_irq(ci->irq);
 		usb_put_hcd(hcd);
 		if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))


Patches currently in stable-queue which might be from stefan.wahren@i2se.com are

queue-4.8/usb-chipidea-host-fix-null-ptr-dereference-during-shutdown.patch