linux-kernel - [PATCH 4.4 30/76] USB: lvtest: fix NULL-deref at probe

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Message-Id: <20170328122601.193720990@linuxfoundation.org>
Date:   Tue, 28 Mar 2017 14:30:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pratyush Anand <pratyush.anand@...il.com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.4 30/76] USB: lvtest: fix NULL-deref at probe

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 1dc56c52d2484be09c7398a5207d6b11a4256be9 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should the probed device lack endpoints.

Note that this driver does not bind to any devices by default.

Fixes: ce21bfe603b3 ("USB: Add LVS Test device driver")
Cc: Pratyush Anand <pratyush.anand@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/misc/lvstest.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -370,6 +370,10 @@ static int lvs_rh_probe(struct usb_inter
 
 	hdev = interface_to_usbdev(intf);
 	desc = intf->cur_altsetting;
+
+	if (desc->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	endpoint = &desc->endpoint[0].desc;
 
 	/* valid only for SS root hub */