From 7365abbade07f9181cbd013669642f129e9ec635 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski
Date: Tue, 22 Mar 2016 14:25:24 -0700
Subject: drivers/hid/uhid.c: check write() bitness using in_compat_syscall

uhid changes the format expected in write() depending on bitness.  It
should check the syscall bitness directly.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/hid/uhid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index e094c572b86e..16b6f11a0700 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -384,7 +384,7 @@ struct uhid_create_req_compat {
 static int uhid_event_from_user(const char __user *buffer, size_t len,
 				struct uhid_event *event)
 {
-	if (is_compat_task()) {
+	if (in_compat_syscall()) {
 		u32 type;
 
 		if (get_user(type, buffer))
-- 
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