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Sat, 3 Feb 2018 13:16:46 -0500 Received: from mail-bl2nam02on0091.outbound.protection.outlook.com ([104.47.38.91]:39758 "EHLO NAM02-BL2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752914AbeBCSHE (ORCPT ); Sat, 3 Feb 2018 13:07:04 -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 3.18 21/24] xen/gntdev: Fix off-by-one error when unmapping with holes Thread-Topic: [PATCH AUTOSEL for 3.18 21/24] xen/gntdev: Fix off-by-one error when unmapping with holes Thread-Index: AQHTnRmHuNhLl6CN60Cj61sBgP5RQQ== Date: Sat, 3 Feb 2018 18:05:09 +0000 Message-ID: <20180203180444.10801-21-alexander.levin@microsoft.com> References: <20180203180444.10801-1-alexander.levin@microsoft.com> In-Reply-To: <20180203180444.10801-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;BL0PR2101MB1025;7:a5pNsPihjAV0ocamWVncdVT29L/nE2cyEjCii8MYgLhq+GlqFSexPg+EcVeVsZzovelcoEG6fUgYd9g75VDkOYe1Q8TVHn39vOh+FwwpxiHkgaT9Oca1ImPFWxk+eWYHeRDwddyfSGAQxpCsKEKEbrXsbzsW66Gl8G2pzSvRw7V4ujqrLOLeJgcmbqZL2IuuSBo9ceXRRhrd10zN+mEx4IlJm5Jicn9T+9g51eLQ5ambhQFY/Ghu68KWeaMeZDSi x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 204c88f1-c9f3-434f-bfe3-08d56b30e390 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(4534165)(4627221)(201703031133081)(201702281549075)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:BL0PR2101MB1025; 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authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: gQ7PXY6MJhCjc9ABmjjt9KyQL04b+DN/6O6J7cQBho/Yw+mqVP8X+ZJAvWSYP+k86JcOWjXb/4wA/l6urnVa6w== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 204c88f1-c9f3-434f-bfe3-08d56b30e390 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Feb 2018 18:05:09.6277 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB1025 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@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 91cc44611062..1c03e30f66b4 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -348,10 +348,8 @@ 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