linux-kernel - [PATCH 3.16 042/178] uwb: hwa-rc: fix NULL-deref at probe

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Date:   Sun, 16 Jul 2017 14:56:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>,
        "David Vrabel" <david.vrabel@....com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Inaky Perez-Gonzalez" <inaky.perez-gonzalez@...el.com>
Subject: [PATCH 3.16 042/178] uwb: hwa-rc: fix NULL-deref at probe

3.16.46-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit daf229b15907fbfdb6ee183aac8ca428cb57e361 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 start callback which is called
during probe.

Fixes: de520b8bd552 ("uwb: add HWA radio controller 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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/uwb/hwa-rc.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/uwb/hwa-rc.c
+++ b/drivers/uwb/hwa-rc.c
@@ -825,6 +825,9 @@ static int hwarc_probe(struct usb_interf
 	struct hwarc *hwarc;
 	struct device *dev = &iface->dev;
 
+	if (iface->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	result = -ENOMEM;
 	uwb_rc = uwb_rc_alloc();
 	if (uwb_rc == NULL) {