linux-kernel - [PATCH v2] usb: cdns3: change place of NULL check in cdns3_gadget_ep

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Message-Id: <20220728163014.247082-1-strochuk@ispras.ru>
Date:   Thu, 28 Jul 2022 19:30:14 +0300
From:   Andrey Strachuk <strochuk@...ras.ru>
To:     Peter Chen <peter.chen@...nel.org>
Cc:     Andrey Strachuk <strochuk@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v2] usb: cdns3: change place of NULL check in cdns3_gadget_ep_enable()

If 'ep' is NULL, result of ep_to_cdns3_ep(ep) is invalid and
priv_ep->cdns3_dev causes panic.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Andrey Strachuk <strochuk@...ras.ru>
Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
---
 drivers/usb/cdns3/cdns3-gadget.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 5c15c48952a6..51de7457a3b8 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2284,11 +2284,14 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep,
 	int ret = 0;
 	int val;
 
+	if (!ep)
+		return -EINVAL;
+
 	priv_ep = ep_to_cdns3_ep(ep);
 	priv_dev = priv_ep->cdns3_dev;
 	comp_desc = priv_ep->endpoint.comp_desc;
 
-	if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+	if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
 		dev_dbg(priv_dev->dev, "usbss: invalid parameters\n");
 		return -EINVAL;
 	}
-- 
2.25.1