HID: uhid: fix leak for 64/32 UHID_CREATE

commit 80897aa787ecd58eabb29deab7cbec9249c9b7e6 upstream.

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>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 145a4cb..0bb3bb8 100644 (file)
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -312,7 +312,7 @@ 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;