linux-kernel - [PATCH 3.10 188/250] uwb: hwa-rc: fix NULL-deref at probe

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Message-Id: <1496876436-32402-189-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:59:34 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Johan Hovold <johan@...nel.org>,
        Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
        David Vrabel <david.vrabel@....com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 188/250] uwb: hwa-rc: fix NULL-deref at probe

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: Willy Tarreau <w@....eu>
---
 drivers/uwb/hwa-rc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/uwb/hwa-rc.c b/drivers/uwb/hwa-rc.c
index 810c90a..cd8bf69 100644
--- a/drivers/uwb/hwa-rc.c
+++ b/drivers/uwb/hwa-rc.c
@@ -811,6 +811,9 @@ static int hwarc_probe(struct usb_interface *iface,
 	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) {
-- 
2.8.0.rc2.1.gbe9624a