linux-kernel - [PATCH 3.10 185/250] USB: idmouse: fix NULL-deref at probe

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Message-Id: <1496876436-32402-186-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:59:31 +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>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 185/250] USB: idmouse: fix NULL-deref at probe

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

commit b0addd3fa6bcd119be9428996d5d4522479ab240 upstream.

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

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/usb/misc/idmouse.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
index ce97838..3b885c6 100644
--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -347,6 +347,9 @@ static int idmouse_probe(struct usb_interface *interface,
 	if (iface_desc->desc.bInterfaceClass != 0x0A)
 		return -ENODEV;
 
+	if (iface_desc->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	/* allocate memory for our device state and initialize it */
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (dev == NULL)
-- 
2.8.0.rc2.1.gbe9624a