linux-kernel - [PATCH] usb: gadget: atmel_usba: Fix crashed during stopping when DEBUG is enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1393598066-4016-1-git-send-email-gregory.clement@free-electrons.com>
Date:	Fri, 28 Feb 2014 15:34:01 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Felipe Balbi <balbi@...com>
Cc:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	stable@...r.kernel.org
Subject: [PATCH] usb: gadget: atmel_usba: Fix crashed during stopping when DEBUG is enabled

The debug trace in the atmel_usba_stop function made the assumption
that the driver pointer passed in parameter was not NULL. Since the
commit "usb: gadget: udc-core: fix a regression during gadget driver
unbinding", it was no more always true. This lead to a kernel crash.

This commit now use the driver pointer stored in udc which fixes this
issue.

Since the commit which have triggered this issue was backported to the
3.2 stable branch, then this one should also be backported to the same
kernel.

Cc: stable@...r.kernel.org # v3.2+
Fixes: 511f3c5326ea (usb: gadget: udc-core: fix a regression during gadget driver unbinding)
---
 drivers/usb/gadget/atmel_usba_udc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 52771d4c44bc..167843de2d8a 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1827,12 +1827,12 @@ static int atmel_usba_stop(struct usb_gadget *gadget,
 	toggle_bias(0);
 	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 
-	udc->driver = NULL;
-
 	clk_disable_unprepare(udc->hclk);
 	clk_disable_unprepare(udc->pclk);
 
-	DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
+	DBG(DBG_GADGET, "unregistered driver `%s'\n", udc->driver->driver.name);
+
+	udc->driver = NULL;
 
 	return 0;
 }
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/