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Miller" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 17/36] net_sched: red: Avoid devision by zero Thread-Topic: [PATCH AUTOSEL for 4.4 17/36] net_sched: red: Avoid devision by zero Thread-Index: AQHTmIdVrrS3hOgtXE2mOTxm8647dQ== Date: Sun, 28 Jan 2018 22:28:34 +0000 Message-ID: <20180128222815.29479-17-alexander.levin@microsoft.com> References: <20180128222815.29479-1-alexander.levin@microsoft.com> In-Reply-To: <20180128222815.29479-1-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;MW2PR2101MB1115;7:zTO5tD859n0axNYfO6b11/RYm7QAnmsvBqm0GsspK37ILOlaEoKbZXlmRcz94Cla/35wEcSq4ldxR0kQlk6AmpWBEvIndua/YUP6Y33cfhpP4AWJJHwIFwxWPW4wl6tZ2/9iSLcC929C2/zfx47REqdrMHGzq4S00mV2n25xCBuEtdS2S1ev2Fc0XUdUM6LAOPZNoR+qtEyf9Uq1KjOF8ewlAfXr0EjXiuOp1S/cm869AbSPrbOlqM4CpC7J6x0l x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 7c7ca40e-77e5-44e9-3c1a-08d5669ea3f4 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1115; x-ms-traffictypediagnostic: MW2PR2101MB1115: 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); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(61425038)(6040501)(2401047)(5005006)(8121501046)(93006095)(93001095)(3002001)(10201501046)(3231101)(944501161)(6055026)(61426038)(61427038)(6041288)(20161123560045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123558120)(20161123564045)(20161123562045)(6072148)(201708071742011);SRVR:MW2PR2101MB1115;BCL:0;PCL:0;RULEID:;SRVR:MW2PR2101MB1115; x-forefront-prvs: 05669A7924 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(376002)(346002)(39860400002)(396003)(366004)(39380400002)(199004)(189003)(3280700002)(2906002)(4326008)(6486002)(6512007)(102836004)(53936002)(97736004)(1076002)(3660700001)(105586002)(3846002)(54906003)(110136005)(186003)(66066001)(25786009)(26005)(305945005)(6116002)(99286004)(107886003)(6436002)(81156014)(5250100002)(81166006)(8676002)(22452003)(86362001)(2950100002)(36756003)(316002)(478600001)(106356001)(8936002)(2501003)(5660300001)(7736002)(575784001)(6666003)(72206003)(10090500001)(68736007)(10290500003)(86612001)(2900100001)(14454004)(76176011)(59450400001)(6506007)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:MW2PR2101MB1115;H:MW2PR2101MB1034.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; x-microsoft-antispam-message-info: UgXuHwZGI9xefTSYeoWTQPgOvODhzeOFLgYOo4P0AGUsnIbsSYZJaTfrBjZ1ky5/KIb82MJFA/One6rHEWU7AA== 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: 7c7ca40e-77e5-44e9-3c1a-08d5669ea3f4 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Jan 2018 22:28:34.8479 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1115 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: Nogah Frankel [ Upstream commit 5c472203421ab4f928aa1ae9e1dbcfdd80324148 ] Do not allow delta value to be zero since it is used as a divisor. Fixes: 8af2a218de38 ("sch_red: Adaptative RED AQM") Signed-off-by: Nogah Frankel Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- include/net/red.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/red.h b/include/net/red.h index 76e0b5f922c6..ba5039418a93 100644 --- a/include/net/red.h +++ b/include/net/red.h @@ -178,7 +178,7 @@ static inline void red_set_parms(struct red_parms *p, p->qth_max =3D qth_max << Wlog; p->Wlog =3D Wlog; p->Plog =3D Plog; - if (delta < 0) + if (delta <=3D 0) delta =3D 1; p->qth_delta =3D delta; if (!max_P) { --=20 2.11.0