linux-kernel - [PATCH 1/1] usb: gadget: avoid exposing kernel stack

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Date:	Sun,  8 May 2016 23:20:59 +0200
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Felipe Balbi <balbi@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <zonque@...il.com>,
	Peter Chen <peter.chen@...escale.com>,
	Robert Baldyga <r.baldyga@...sung.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	John Youn <John.Youn@...opsys.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH 1/1] usb: gadget: avoid exposing kernel stack

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

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 186d4b1..23cba7b 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1292,6 +1292,7 @@ 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;
-- 
2.1.4