From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4E05C169C4 for ; Wed, 6 Feb 2019 05:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9AB4E20823 for ; Wed, 6 Feb 2019 05:01:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726568AbfBFFBF (ORCPT ); Wed, 6 Feb 2019 00:01:05 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:55276 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726037AbfBFFBE (ORCPT ); Wed, 6 Feb 2019 00:01:04 -0500 Received: by mail-it1-f200.google.com with SMTP id v3so2553798itf.4 for ; Tue, 05 Feb 2019 21:01:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=X4F/sDIZEdS7NwnVbe37i/9aMAfDzAT04hQIjzToG34=; b=ibikVTnEBXL0FVxnooMhElVoMESPFwQr4yRQJCeBJuzyl1C2LXeFsStpFFTqpkr6yu CLyImHkE6419k21UhhdhVU6FxwjJfCxEvxZmAgIFo8SaaqizKt/RFeyaQuF4Gby7NP60 LYM5AwCK26phFAqxd8pPT2KQSKQsSKlUk1e/yhTlxJFLvVdJO2/PHl0q/CjLtmBUlF2O NTADw5q5ODB4Shx2GHpvK5AaJdbYpZHHAFnU4tdcHSkn1tfCQ0i8er4sVEY9UFM3o0h1 jsEuKAJ6wAnW264Yda4q61V5sIinkTyrExHpfh96QQPBH5BNAX/soIgjasc4iU2z+h/1 fq7w== X-Gm-Message-State: AHQUAuY+UAYCBqgpfEjPsTkGuUKv1HZeRx4Au3sfZU6eQHt/FOhtK1Bc rqOKam61pdDRcaGyH2zMVe0yRvrPavWRiJEnxkocgq1MQCZF X-Google-Smtp-Source: AHgI3IZFdy8CGW8wNkpS7+qG0QlGTFG7zYp6KLzvliHgJJjD6m0fcAaZq44goiktGIt74bOQZiYz04U4Qox5hoRbBtW0hsXoo9rQ MIME-Version: 1.0 X-Received: by 2002:a6b:d11a:: with SMTP id l26mr5882908iob.34.1549429263674; Tue, 05 Feb 2019 21:01:03 -0800 (PST) Date: Tue, 05 Feb 2019 21:01:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ddb37c0581329cc5@google.com> Subject: KASAN: use-after-free Read in tcp_sk_exit From: syzbot To: davem@davemloft.net, edumazet@google.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 33a0efa4baec devlink: Use DIV_ROUND_UP_ULL in DEVLINK_HEAL.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14e2e55f400000 kernel config: https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68 dashboard link: https://syzkaller.appspot.com/bug?extid=f797267da5e5012d0920 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f797267da5e5012d0920@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] BUG: KASAN: use-after-free in tcp_sk_exit+0x203/0x230 net/ipv4/tcp_ipv4.c:2588 Read of size 8 at addr ffff888064de4378 by task kworker/u4:3/131 CPU: 0 PID: 131 Comm: kworker/u4:3 Not tainted 5.0.0-rc3+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] tcp_sk_exit+0x203/0x230 net/ipv4/tcp_ipv4.c:2588 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 5864: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 getname+0x1a/0x20 fs/namei.c:211 do_sys_open+0x3a5/0x7c0 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5864: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 do_sys_open+0x3f4/0x7c0 fs/open.c:1072 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888064de4180 which belongs to the cache names_cache of size 4096 The buggy address is located 504 bytes inside of 4096-byte region [ffff888064de4180, ffff888064de5180) The buggy address belongs to the page: page:ffffea0001937900 count:1 mapcount:0 mapping:ffff88821bc45380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001931108 ffffea0001796b88 ffff88821bc45380 raw: 0000000000000000 ffff888064de4180 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888064de4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064de4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888064de4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064de4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064de4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.