HID: uhid: fix leak for 64/32 UHID_CREATE
authorDavid Herrmann <dh.herrmann@gmail.com>
Tue, 26 Nov 2013 12:58:18 +0000 (13:58 +0100)
committerJiri Kosina <jkosina@suse.cz>
Wed, 27 Nov 2013 09:53:49 +0000 (10:53 +0100)
UHID allows short writes so user-space can omit unused fields. We
automatically set them to 0 in the kernel. However, the 64/32 bit
compat-handler didn't do that in the UHID_CREATE fallback. This will
reveal random kernel heap data (of random size, even) to user-space.

Fixes: befde0226a59 ('HID: uhid: make creating devices work on 64/32 systems')

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/uhid.c

index 93b00d76374cee2b82be0a9deab2a0f8d7c6755b..cedc6da93c19c5c77136127feb207a424899a321 100644 (file)
@@ -287,7 +287,7 @@ static int uhid_event_from_user(const char __user *buffer, size_t len,
                         */
                        struct uhid_create_req_compat *compat;
 
-                       compat = kmalloc(sizeof(*compat), GFP_KERNEL);
+                       compat = kzalloc(sizeof(*compat), GFP_KERNEL);
                        if (!compat)
                                return -ENOMEM;