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Miller" , Ilias Apalodimas , Jesper Dangaard Brouer Subject: Re: [net RFC v1 1/1] page_pool: fix NULL dereference crash Message-ID: <20220122194615.GA914030@euler> References: <20220122005644.802352-1-colin.foster@in-advantage.com> <20220122005644.802352-2-colin.foster@in-advantage.com> <20220122024051.GA905413@euler> <5bd8f1bd-1a21-df1b-6d6f-9fe5657fdd7c@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5bd8f1bd-1a21-df1b-6d6f-9fe5657fdd7c@redhat.com> X-ClientProxiedBy: CO2PR05CA0009.namprd05.prod.outlook.com (2603:10b6:102:2::19) To MWHPR1001MB2351.namprd10.prod.outlook.com (2603:10b6:301:35::37) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0dbb78b4-6c39-4bfe-0f04-08d9dddfde29 X-MS-TrafficTypeDiagnostic: MWHPR10MB2045:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:655; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR1001MB2351.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(7916004)(346002)(376002)(42606007)(136003)(39830400003)(366004)(396003)(66556008)(186003)(38350700002)(6916009)(54906003)(6666004)(508600001)(5660300002)(26005)(7416002)(38100700002)(52116002)(66476007)(316002)(2906002)(4326008)(86362001)(6512007)(33656002)(33716001)(53546011)(1076003)(8676002)(66946007)(44832011)(9686003)(83380400001)(6486002)(6506007)(8936002);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?g37wnPWBzgnlt0gKipfxvkxOrng65aP28eRftOCIQhtItSSaE/hs483unb/A?= =?us-ascii?Q?Hk4Yf/KS99JYBhCrfz9bWM9L7AMxK9oKeTV8lvBEgGwA/ArEYp4wC6t1n/Bd?= =?us-ascii?Q?1pB0AewCMcShR7820L4DibTLyINabR1QKmoRkkO15/sgLkIfQwy2eM/RaoQh?= =?us-ascii?Q?UAOUqUPUM6/2ruUDTncRQ6USnwWi5EhD8E3PG38y2HOBbBYKgl4tDOJG7WbU?= =?us-ascii?Q?7eUuAY3ksmcbMG5Z/EYOxesLVhpaYfPORKtQ985Wzc1kHRioDgyg0l8mDLry?= =?us-ascii?Q?0EIUb7qdW8piVzFz4CgTsLI8rlPst9u4mfF5ImiS1F8CeHs5XE3UxlRvP9Dy?= =?us-ascii?Q?xf4gQIUNW5L8rgQU/szJmiBKar0VU2GmPDJtO6349T1zEu6K5/amSCdNfPXa?= =?us-ascii?Q?dd/+pQ4k99b/sA0CoTDuu4s8pbBxVjsGBqFgGWbivqoobe80Derb3f/IJMmN?= =?us-ascii?Q?mgRfpbCm/YV9Y2EYGdWqdFmHkw+Fotm/E91bCSkDiTPs7M9HHddVlySBLJQY?= =?us-ascii?Q?69X76b5NpzQpyKc+2g5fcHSBLE218qe+kbf2Oz7dN8GAHmMsl7klPcIRDO/9?= =?us-ascii?Q?nNE647DmeB0WDZQ6GNNyZAXurLvwOSwBslwpacq1klOMPm9dnkVmaBf/lbBt?= =?us-ascii?Q?qkDRO+UbqjEL6mb1bj5aAG0WWq5JT+9brR4rU7nMzKPbJ+6FIB2I1V/W4L6L?= =?us-ascii?Q?G+MmITqXbTVO6a+wWvWVdufxpAjUY5+/sfssps0MZ2V6RWw6tD//Jt1yGTuJ?= =?us-ascii?Q?Y/yRNtI/QS2dY7tBbQlLuKD99O73TJZman+9RJwNDtPrf7YwMln7o/JYhZ3r?= =?us-ascii?Q?NFHBHjrhEuqp7O2G+mMYZ+xgU9GLT2J3FQbAfcMrwaKzuGSsYGdtZgrLvVj+?= =?us-ascii?Q?bkRwmaveUE76yZwiKVvLDYKsp1PMtV6KVabl+l0tM1V3y+VSo5q4VHkaJJFB?= =?us-ascii?Q?MBJ4Ps1XKVON6uOOVgfmHiO74+62amoau88DkxwVJiP4V+kHpRWGNTRy4f+S?= =?us-ascii?Q?1HtswftGxdaGzf3MDlmxPgBTuPfEOEmcwwYjE7tXECkOGAGDDrMhsCNh0l4L?= =?us-ascii?Q?3LnXVdcT90M9zkYLEeFNYje1ELgEwquRqP4DlE0c+LkaEug/ZRadgcziX3qX?= =?us-ascii?Q?JMUnXzmSldjbu6m31rjMkW4w9QsQ7StR3tU33F9MfULY/pWJ9OJalXUMce7W?= =?us-ascii?Q?l7H2Ft20TPL7FxymnYsJlPY7F4urZTIcIlE5jSDJ0NVIx+mG5a6srjBAUToA?= =?us-ascii?Q?g1psbafvp+9KP2b1rYDsMJOJXButzjQRHsR15FspcdogAKENC8KNJ5wu8C1V?= =?us-ascii?Q?nWRpFTQErwvfs0GnLruAWqso8hkptHZuxI6fvweu/YnKk37bvSdPNu+UmB6k?= =?us-ascii?Q?k6BWu3ztDg8QxlK5mDU1KT4tLL3a0g9JqZJPwiu2g8bpCPZ/cDkDvjbKKqXZ?= =?us-ascii?Q?jwtAX0hCzwBS8/DbAZD4oa+f3QnbuNNkdD5FMjIhmQMZEtD/6NUNjExBWrfi?= =?us-ascii?Q?cxLBVvfSLrB8lronWAvWBYdMApsyPtX5F2aNSwoBoFUxVlkVgBKO6/L+Y/IV?= =?us-ascii?Q?qWQDOgoa6Auo+/eSY1xhf25WLyFaBayLzTEf4L2mlQJ1HdNLQh2+W1scdTfW?= =?us-ascii?Q?S6Bi3tpToBvp21nmfITdf2HDbGYaHuBP3tTifIdqmPXps62uge3a794NrRBu?= =?us-ascii?Q?ItzeDg=3D=3D?= X-OriginatorOrg: in-advantage.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0dbb78b4-6c39-4bfe-0f04-08d9dddfde29 X-MS-Exchange-CrossTenant-AuthSource: MWHPR1001MB2351.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jan 2022 19:46:22.8063 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 48e842ca-fbd8-4633-a79d-0c955a7d3aae X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ca2aztkyd+0WzWlb2TlfL4H7yKvLXj+GKnW74P+yMOw5zx/6jQTxxRtsP05qn+uCCf7nRoNA6SRSlpnP8y7Nx5xsENU2VzmhJBHdbZxH748= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB2045 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jan 22, 2022 at 09:31:17AM +0100, Jesper Dangaard Brouer wrote: > > > On 22/01/2022 03.40, Colin Foster wrote: > > On Fri, Jan 21, 2022 at 05:13:28PM -0800, Alexei Starovoitov wrote: > > > On Fri, Jan 21, 2022 at 4:57 PM Colin Foster > > > wrote: > > > > > > > > Check for the existence of page pool params before dereferencing. This can > > > > cause crashes in certain conditions. > > > > > > In what conditions? > > > Out of tree driver? > > > > > > > Fixes: 35b2e549894b ("page_pool: Add callback to init pages when they are > > > > allocated") > > > > > > > > Signed-off-by: Colin Foster > > > > --- > > > > net/core/page_pool.c | 2 +- > > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > > > diff --git a/net/core/page_pool.c b/net/core/page_pool.c > > > > index bd62c01a2ec3..641f849c95e7 100644 > > > > --- a/net/core/page_pool.c > > > > +++ b/net/core/page_pool.c > > > > @@ -213,7 +213,7 @@ static void page_pool_set_pp_info(struct page_pool *pool, > > > > { > > > > page->pp = pool; > > > > page->pp_magic |= PP_SIGNATURE; > > > > - if (pool->p.init_callback) > > > > + if (pool->p && pool->p.init_callback) > > > > And my apologies - this should be if (pool... not if (pool->p. kernelbot > > will be sure to tell me of this blunder soon > > Can you confirm if your crash is fixed by this change? Yes, this is confirmed. I'd obviously like to make a more comprehensive commit message - my main question is "is this an issue for all DSA configurations?" Seemingly that is the case, but like I said, I'm unfamiliar with this code. I'll see if I can get a better understanding before sending the real patch early next week. > > > > > > pool->p.init_callback(page, pool->p.init_arg); > > > > } >