From: Oliver Neukum <oliver@neukum.org>
Date: Fri, 17 Apr 2009 21:20:06 +0000 (+0000)
Subject: USB: fix oops in cdc-wdm in case of malformed descriptors
X-Git-Tag: v2.6.29.2~21
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4be149f9b684906505d49932fd18e1f17721b30f;p=thirdparty%2Fkernel%2Fstable.git

USB: fix oops in cdc-wdm in case of malformed descriptors

upstream commit: e13c594f3a1fc2c78e7a20d1a07974f71e4b448f

cdc-wdm needs to ignore extremely malformed descriptors.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 3771d6e6d0ccb..34e6108e1d42b 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -652,7 +652,7 @@ next_desc:
 
 	iface = &intf->altsetting[0];
 	ep = &iface->endpoint[0].desc;
-	if (!usb_endpoint_is_int_in(ep)) {
+	if (!ep || !usb_endpoint_is_int_in(ep)) {
 		rv = -EINVAL;
 		goto err;
 	}