linux-kernel - [PATCH 3.12 087/142] USB: wusbcore: fix NULL-deref at probe

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Message-Id: <84eeabc2289c82b471e4c9932f0741570673fb41.1491838390.git.jslaby@suse.cz>
Date:   Mon, 10 Apr 2017 17:32:48 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
        David Vrabel <david.vrabel@....com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 087/142] USB: wusbcore: fix NULL-deref at probe

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

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

===============

commit 03ace948a4eb89d1cf51c06afdfc41ebca5fdb27 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

This specifically fixes the NULL-pointer dereference when probing HWA HC
devices.

Fixes: df3654236e31 ("wusb: add the Wire Adapter (WA) core")
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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/wusbcore/wa-hc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/wusbcore/wa-hc.c b/drivers/usb/wusbcore/wa-hc.c
index a09b65ebd9bb..2bb0fd3f3423 100644
--- a/drivers/usb/wusbcore/wa-hc.c
+++ b/drivers/usb/wusbcore/wa-hc.c
@@ -38,6 +38,9 @@ int wa_create(struct wahc *wa, struct usb_interface *iface)
 	int result;
 	struct device *dev = &iface->dev;
 
+	if (iface->cur_altsetting->desc.bNumEndpoints < 3)
+		return -ENODEV;
+
 	result = wa_rpipes_create(wa);
 	if (result < 0)
 		goto error_rpipes_create;
-- 
2.12.2