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Miller" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 116/167] mISDN: Fix a sleep-in-atomic bug Thread-Topic: [PATCH AUTOSEL for 4.4 116/167] mISDN: Fix a sleep-in-atomic bug Thread-Index: AQHTv5xsmfWWEW5M6UiLQNRELPsJHw== Date: Mon, 19 Mar 2018 16:07:47 +0000 Message-ID: <20180319160513.16384-116-alexander.levin@microsoft.com> References: <20180319160513.16384-1-alexander.levin@microsoft.com> In-Reply-To: <20180319160513.16384-1-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;DM5PR2101MB0919;7:syXeGtqGc1w6yCDguOGu9xTz6ihPe9Zr5Lbp9VX8HvNJ2kEhHX8zA7vLP5hUYot1crcvRq56IzkfRKeZZ5/5Bu45iQVBEIO8ya9HTI/Xldngc29kfTwuAFwtqxxWDwdKOq3kb0X+aLTbS3M57E/LJAMFqEpZfuOqg2ABMJqTA/gwn7iq0VWH6/52o2R7Ap82vgNEoQOM5f/t/5oOIVfk6JLeGbXw6jZlva6AAEdUJmhTpwIEJKXWMFtTIi7FL56b;20:Rrds6A/WkWz2u8gxYF9jzLJ2IxWJCeEvxJF/K+cD3qTh1XoHpfNoLm8AtvZOCan20/L0VkBCKJpf7enmnnwXwwKwJmdiJFamRz4pOXpxRbFu3b8gOAvu/PoFJUXZiO9OFbMMJ7i3pK0jKMkW5RLmVgvasW6TluvreEQH8naG+3k= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 27634439-6971-49f8-c339-08d58db3de8c x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0919; x-ms-traffictypediagnostic: DM5PR2101MB0919: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(130843839470238); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(3231221)(944501300)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(20161123562045)(20161123564045)(20161123558120)(6072148)(201708071742011);SRVR:DM5PR2101MB0919;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0919; x-forefront-prvs: 06167FAD59 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(346002)(39380400002)(396003)(39860400002)(376002)(366004)(199004)(189003)(66066001)(2906002)(86362001)(10290500003)(105586002)(8676002)(305945005)(110136005)(478600001)(4326008)(7736002)(81166006)(3280700002)(6506007)(97736004)(107886003)(5660300001)(36756003)(8936002)(53936002)(86612001)(14454004)(59450400001)(1076002)(2501003)(6116002)(10090500001)(76176011)(186003)(3846002)(5250100002)(6512007)(99286004)(102836004)(106356001)(72206003)(81156014)(2950100002)(6666003)(54906003)(3660700001)(22452003)(68736007)(6486002)(25786009)(26005)(316002)(2900100001)(6436002)(22906009)(31853002)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0919;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: JskI+DgxGu8d2qOpGP/prb1KGygIlcBvNkfGwvkHkrjnosJOk9ioaARAAaBmNYqP4hoxpqbROG34Yd604U4ulO0vbSaqJEljQsdsC0/M9csIRzWghmkHwF2UTlas69MyBbwVCeCVaOchHkIuhBofBhDPhk1NX3WqQPuPRaGCpEbM1YmmD0JeWh8sGEFzE424UXReboqLXJTFBJBTfKptX3ZXacyGmD5JEfJ5rWeXQA0duJc9Qmb87amZjiyb6jW3Dz2iwpJB9dwIFi8agXpBcvxoYUQxKiENL8z+HJi9+ViX5knD7QP1RhU/Cu7HSC5jI+pLtoPI9oqbRm5RIfAjBA== 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: 27634439-6971-49f8-c339-08d58db3de8c X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:07:47.9856 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0919 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jia-Ju Bai [ Upstream commit 93818da5eed63fbc17b64080406ea53b86b23309 ] The driver may sleep under a read spin lock, and the function call path is: send_socklist (acquire the lock by read_lock) skb_copy(GFP_KERNEL) --> may sleep To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC". Signed-off-by: Jia-Ju Bai Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/isdn/mISDN/stack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c index 9cb4b621fbc3..b92a19a594a1 100644 --- a/drivers/isdn/mISDN/stack.c +++ b/drivers/isdn/mISDN/stack.c @@ -72,7 +72,7 @@ send_socklist(struct mISDN_sock_list *sl, struct sk_buff = *skb) if (sk->sk_state !=3D MISDN_BOUND) continue; if (!cskb) - cskb =3D skb_copy(skb, GFP_KERNEL); + cskb =3D skb_copy(skb, GFP_ATOMIC); if (!cskb) { printk(KERN_WARNING "%s no skb\n", __func__); break; --=20 2.14.1