[PATCH 3.16 039/178] USB: idmouse: fix NULL-deref at probe

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.16 039/178] USB: idmouse: fix NULL-deref at probe
Date	2017-07-16 16:00 +0200
Message-ID	<u3Sfw-89R-21@gated-at.bofh.it> (permalink)
References	<u3Sfv-89R-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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

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

From: Johan Hovold <johan@kernel.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@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/usb/misc/idmouse.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -346,6 +346,9 @@ static int idmouse_probe(struct usb_inte
 	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)

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[PATCH 3.16 039/178] USB: idmouse: fix NULL-deref at probe Ben Hutchings <ben@decadent.org.uk> - 2017-07-16 16:00 +0200

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