From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965649AbcKNDcG (ORCPT ); Sun, 13 Nov 2016 22:32:06 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:45387 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753379AbcKNCFH (ORCPT ); Sun, 13 Nov 2016 21:05:07 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Al Viro" Date: Mon, 14 Nov 2016 00:14:20 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 291/346] blackfin: fix copy_from_user() In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.39-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro commit 8f035983dd826d7e04f67b28acf8e2f08c347e41 upstream. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings --- arch/blackfin/include/asm/uaccess.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -177,11 +177,12 @@ static inline int bad_user_access_length static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { - if (access_ok(VERIFY_READ, from, n)) + if (likely(access_ok(VERIFY_READ, from, n))) { memcpy(to, (const void __force *)from, n); - else - return n; - return 0; + return 0; + } + memset(to, 0, n); + return n; } static inline unsigned long __must_check