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Sat, 3 Feb 2018 13:14:55 -0500 Received: from mail-co1nam03on0107.outbound.protection.outlook.com ([104.47.40.107]:45036 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753403AbeBCSHL (ORCPT ); Sat, 3 Feb 2018 13:07:11 -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 4.4 30/32] xen/gntdev: Fix partial gntdev_mmap() cleanup Thread-Topic: [PATCH AUTOSEL for 4.4 30/32] xen/gntdev: Fix partial gntdev_mmap() cleanup Thread-Index: AQHTnRl2jDgMZ5ehJka6natczJwYGg== Date: Sat, 3 Feb 2018 18:04:41 +0000 Message-ID: <20180203180413.7438-30-alexander.levin@microsoft.com> References: <20180203180413.7438-1-alexander.levin@microsoft.com> In-Reply-To: <20180203180413.7438-1-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;BL0PR2101MB1009;7:RUPVZ3JRg40gNk627R2HW/4hbXPTIhL2vP2s+NhQ7MMCt7NFf72IraujbNRhBCzR6UZd2/F/UGQGlYmaHsvHILctsWdjlG/zaEiELaBCgE9CkVTwgD6j05O/PBBcAaavcBSzge6kzlvcy7/XAwtZsNhfyQx3wQpHo91OLI4glQhQrmwMLhv4Tr+MCN0AYNyfZl9a3VRbIB/nvyzFDdgpkIFp3fa8kvPGrH99yPkHaZHh0vQLyXLoLpZsFPmhy/sW x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 26b3c427-f28e-453e-1e77-08d56b30c914 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(4534165)(4627221)(201703031133081)(201702281549075)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:BL0PR2101MB1009; 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authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: kRnJZZVmBcLgY89g7HOfcXAJT508Lzrn7hs6yYTbsJvB+yzEfyMi4qTZXC6GiYYnRdWJjzcHfRNobkkGVcHtCw== 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: 26b3c427-f28e-453e-1e77-08d56b30c914 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Feb 2018 18:04:41.3308 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB1009 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 cf2acf66ad43abb39735568f55e1f85f9844e990 ] When cleaning up after a partially successful gntdev_mmap(), unmap the successfully mapped grant pages otherwise Xen will kill the domain if in debug mode (Attempt to implicitly unmap a granted PTE) or Linux will kill the process and emit "BUG: Bad page map in process" if Xen is in release mode. This is only needed when use_ptemod is true because gntdev_put_map() will unmap grant pages itself when use_ptemod is false. 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, 3 insertions(+), 1 deletion(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 44a9d8eb0eb4..1865bcfa869b 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -874,8 +874,10 @@ unlock_out: out_unlock_put: mutex_unlock(&priv->lock); out_put_map: - if (use_ptemod) + if (use_ptemod) { map->vma =3D NULL; + unmap_grant_pages(map, 0, map->count); + } gntdev_put_map(priv, map); return err; } --=20 2.11.0