Patch "usb: gadget: avoid exposing kernel stack" has been added to the 4.4-stable tree

Patch "usb: gadget: avoid exposing kernel stack" has been added to the 4.4-stable tree

[gregkh]

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

    usb: gadget: avoid exposing kernel stack

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-gadget-avoid-exposing-kernel-stack.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 <stable@vger.kernel.org> know about it.


>From ffeee83aa0461992e8a99a59db2df31933e60362 Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Sun, 8 May 2016 23:20:59 +0200
Subject: usb: gadget: avoid exposing kernel stack

From: Heinrich Schuchardt <xypron.glpk@gmx.de>

commit ffeee83aa0461992e8a99a59db2df31933e60362 upstream.

Function in_rq_cur copies random bytes from the stack.
Zero the memory instead.

Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/function/f_uac2.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1291,6 +1291,7 @@ in_rq_cur(struct usb_function *fn, const
 
 	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
 		struct cntrl_cur_lay3 c;
+		memset(&c, 0, sizeof(struct cntrl_cur_lay3));
 
 		if (entity_id == USB_IN_CLK_ID)
 			c.dCUR = p_srate;


Patches currently in stable-queue which might be from xypron.glpk@gmx.de are

queue-4.4/usb-gadget-avoid-exposing-kernel-stack.patch