From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Sun, 8 May 2016 21:20:59 +0000 (+0200)
Subject: usb: gadget: avoid exposing kernel stack
X-Git-Tag: firefly_0821_release~176^2~4^2~31^2~443
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bbd7cf3d188c2cae5784703d767900c0a9740db7;p=firefly-linux-kernel-4.4.55.git

usb: gadget: avoid exposing kernel stack

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>
---

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 044ca79d3cb5..12628dd36e55 100644
--- 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 struct usb_ctrlrequest *cr)
 
 	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;