Patch "usb: hcd: out of bounds access in for_each_companion" has been added to the 4.4-stable tree

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

usb: hcd: out of bounds access in for_each_companion

to the 4.4-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-hcd-out-of-bounds-access-in-for_each_companion.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Robert Dobrowolski <[email protected]>
Date: Thu, 24 Mar 2016 03:30:07 -0700
Subject: usb: hcd: out of bounds access in for_each_companion

From: Robert Dobrowolski <[email protected]>

commit e86103a75705c7c530768f4ffaba74cf382910f2 upstream.

On BXT platform Host Controller and Device Controller figure as same PCI device but with different device function. HCD should not pass data to Device Controller but only to Host Controllers. Checking if companion device is Host Controller, otherwise skip.

---
 drivers/usb/core/hcd-pci.c |    9 +++++++++
 1 file changed, 9 insertions(+)

@@ -74,6 +74,15 @@ static void for_each_companion(struct pc
 		if (companion->bus != pdev->bus ||
 				PCI_SLOT(companion->devfn) != slot)
 			continue;
+
+		/*
+		 * Companion device should be either UHCI,OHCI or EHCI host
+		 * controller, otherwise skip.
+		 */
+		if (companion->class != CL_UHCI && companion->class != CL_OHCI &&
+				companion->class != CL_EHCI)
+			continue;
+
 		companion_hcd = pci_get_drvdata(companion);
 		if (!companion_hcd || !companion_hcd->self.root_hub)
 			continue;

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/usb-hcd-out-of-bounds-access-in-for_each_companion.patch queue-4.4/usb-xhci-applying-xhci_pme_stuck_quirk-to-intel-bxt-b0-host.patch