From: Oliver Neukum <oliver@neukum.org>
Date: Sat, 4 Apr 2009 07:25:15 +0000 (+0200)
Subject: USB: fix oops in cdc-wdm in case of malformed descriptors
X-Git-Tag: firefly_0821_release~14424^2~17
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=e13c594f3a1fc2c78e7a20d1a07974f71e4b448f;p=firefly-linux-kernel-4.4.55.git

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

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>
---

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 3771d6e6d0cc..34e6108e1d42 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;
 	}