linux-kernel - [PATCH 4.9 46/88] uwb: i1480-dfu: fix NULL-deref at probe

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Message-Id: <20170328122750.595296486@linuxfoundation.org>
Date:   Tue, 28 Mar 2017 14:31:01 +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,
        Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
        David Vrabel <david.vrabel@....com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.9 46/88] uwb: i1480-dfu: fix NULL-deref at probe

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

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

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

commit 4ce362711d78a4999011add3115b8f4b0bc25e8c upstream.

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

Note that the dereference happens in the cmd and wait_init_done
callbacks which are called during probe.

Fixes: 1ba47da52712 ("uwb: add the i1480 DFU driver")
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>
Cc: David Vrabel <david.vrabel@....com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/uwb/i1480/dfu/usb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/uwb/i1480/dfu/usb.c
+++ b/drivers/uwb/i1480/dfu/usb.c
@@ -362,6 +362,9 @@ int i1480_usb_probe(struct usb_interface
 				 result);
 	}
 
+	if (iface->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	result = -ENOMEM;
 	i1480_usb = kzalloc(sizeof(*i1480_usb), GFP_KERNEL);
 	if (i1480_usb == NULL) {