From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-bl2nam02on0113.outbound.protection.outlook.com ([104.47.38.113]:13185 "EHLO NAM02-BL2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752966AbeBCSDo (ORCPT ); Sat, 3 Feb 2018 13:03:44 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Ross Lagerwall , Boris Ostrovsky , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 103/110] xen/gntdev: Fix off-by-one error when unmapping with holes Date: Sat, 3 Feb 2018 18:01:32 +0000 Message-ID: <20180203180015.29073-103-alexander.levin@microsoft.com> References: <20180203180015.29073-1-alexander.levin@microsoft.com> In-Reply-To: <20180203180015.29073-1-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: Ross Lagerwall [ Upstream commit 951a010233625b77cde3430b4b8785a9a22968d1 ] If the requested range has a hole, the calculation of the number of pages to unmap is off by one. Fix it. Signed-off-by: Ross Lagerwall Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky Signed-off-by: Sasha Levin --- drivers/xen/gntdev.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 57efbd3b053b..d3391a1e3796 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -380,10 +380,8 @@ static int unmap_grant_pages(struct grant_map *map, in= t offset, int pages) } range =3D 0; while (range < pages) { - if (map->unmap_ops[offset+range].handle =3D=3D -1) { - range--; + if (map->unmap_ops[offset+range].handle =3D=3D -1) break; - } range++; } err =3D __unmap_grant_pages(map, offset, range); --=20 2.11.0