From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-co1nam03on0092.outbound.protection.outlook.com ([104.47.40.92]:42112 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753394AbeDIASD (ORCPT ); Sun, 8 Apr 2018 20:18:03 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Vladimir Murzin , Russell King , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 053/189] ARM: 8740/1: NOMMU: Make sure we do not hold stale data in mem[] array Date: Mon, 9 Apr 2018 00:17:27 +0000 Message-ID: <20180409001637.162453-53-alexander.levin@microsoft.com> References: <20180409001637.162453-1-alexander.levin@microsoft.com> In-Reply-To: <20180409001637.162453-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: Vladimir Murzin [ Upstream commit 636e645f1f2a5826beacd23548696f1655b0b5d8 ] adjust_lowmem_bounds() called twice which can lead to stalled data (i.e. subreg) value in mem[] array after the first call. Zero out mem[] array before we allocate MPU regions for memory. Fixes: 5c9d9a1b3a54 ("ARM: 8712/1: NOMMU: Use more MPU regions to cover mem= ory") Signed-off-by: Vladimir Murzin Signed-off-by: Russell King Signed-off-by: Sasha Levin --- arch/arm/mm/pmsa-v7.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/mm/pmsa-v7.c b/arch/arm/mm/pmsa-v7.c index 976df60ac426..f65c01fba9f4 100644 --- a/arch/arm/mm/pmsa-v7.c +++ b/arch/arm/mm/pmsa-v7.c @@ -6,6 +6,7 @@ =20 #include #include +#include =20 #include #include @@ -296,6 +297,7 @@ void __init adjust_lowmem_bounds_mpu(void) } } =20 + memset(mem, 0, sizeof(mem)); num =3D allocate_region(mem_start, specified_mem_size, mem_max_regions, m= em); =20 for (i =3D 0; i < num; i++) { --=20 2.15.1