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Wed, 11 Jul 2018 14:37:37 +0000 Subject: [PATCH] fs: Fix double prealloc_shrinker() in sget_fc() From: Kirill Tkhai To: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, dhowells@redhat.com, ktkhai@virtuozzo.com Date: Wed, 11 Jul 2018 17:37:34 +0300 Message-ID: <153131984019.24777.15284245961241666054.stgit@localhost.localdomain> User-Agent: StGit/0.18 MIME-Version: 1.0 X-Originating-IP: [185.231.240.5] X-ClientProxiedBy: LO2P265CA0166.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:9::34) To HE1PR0801MB2025.eurprd08.prod.outlook.com (2603:10a6:3:50::14) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f3222517-2f72-455f-74fd-08d5e73bd9e2 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652040)(8989117)(5600053)(711020)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(2017052603328)(7153060)(7193020); SRVR:HE1PR0801MB2025; X-Microsoft-Exchange-Diagnostics: 1; HE1PR0801MB2025; 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20:K2KuCKjLFDObe7LDGeAoS92bnELWIvM/Rk7+hbSU1QTaOxtnittdwyPZAANxYEVi76Y+UMBwOu0N1PrQjM413AvVGymnKECBV3O9nvgxZ5tH6KK21DVpeCIYAKKN0HMJpCkj+Lm6bSGW7MxU3LsipcItWeBdWwWacOD2o9tYUZE= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jul 2018 14:37:37.9490 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f3222517-2f72-455f-74fd-08d5e73bd9e2 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB2025 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Hi, I'm observing "KASAN: use-after-free Read in shrink_slab" on recent linux-next in the code I've added: https://syzkaller.appspot.com/bug?id=91767fc6346a4b9e0309a8cd7e2f356c434450b9 It seems to be not related to my patchset, since there is a problem with double preallocation of shrinker. We should use register_shrinker_prepared() in sget_fc(), since shrinker is already allocated in alloc_super(). Signed-off-by: Kirill Tkhai --- fs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/super.c b/fs/super.c index 13647d4fd262..47a819f1a300 100644 --- a/fs/super.c +++ b/fs/super.c @@ -551,7 +551,7 @@ struct super_block *sget_fc(struct fs_context *fc, hlist_add_head(&s->s_instances, &s->s_type->fs_supers); spin_unlock(&sb_lock); get_filesystem(s->s_type); - register_shrinker(&s->s_shrink); + register_shrinker_prepared(&s->shrinker); return s; } EXPORT_SYMBOL(sget_fc);