linux-kernel - [PATCH AUTOSEL for 4.9 22/52] usb: gadget: pxa27x: Test for a valid argument pointer

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Date:   Wed, 29 Nov 2017 17:21:18 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Petr Cvek <petr.cvek@....cz>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 22/52] usb: gadget: pxa27x: Test for a valid
 argument pointer

From: Petr Cvek <petr.cvek@....cz>

[ Upstream commit df7545719a14fa7b481896fb8689e23d0a00f682 ]

A call usb_put_phy(udc->transceiver) must be tested for a valid pointer.
Use an already existing test for usb_unregister_notifier call.

Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>
Reported-by: Robert Jarzmik <robert.jarzmik@...e.fr>
Signed-off-by: Petr Cvek <petr.cvek@....cz>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/usb/gadget/udc/pxa27x_udc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/pxa27x_udc.c
index 7fa60f5b7ae4..afd6b86458c5 100644
--- a/drivers/usb/gadget/udc/pxa27x_udc.c
+++ b/drivers/usb/gadget/udc/pxa27x_udc.c
@@ -2534,9 +2534,10 @@ static int pxa_udc_remove(struct platform_device *_dev)
 	usb_del_gadget_udc(&udc->gadget);
 	pxa_cleanup_debugfs(udc);
 
-	if (!IS_ERR_OR_NULL(udc->transceiver))
+	if (!IS_ERR_OR_NULL(udc->transceiver)) {
 		usb_unregister_notifier(udc->transceiver, &pxa27x_udc_phy);
-	usb_put_phy(udc->transceiver);
+		usb_put_phy(udc->transceiver);
+	}
 
 	udc->transceiver = NULL;
 	the_controller = NULL;
-- 
2.11.0