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=-0.5 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 0C609C67838 for ; Mon, 10 Dec 2018 05:41:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C663E20821 for ; Mon, 10 Dec 2018 05:41:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C663E20821 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by 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AA+aEWYBvqnYwvrudLBIPFrwil5wOD0muZ9OYEy7OCMXYKJ7Pp8JsEf6 U7d9AV9sIgFFuL2VwjO7dS4XQBQ0Q8RHWJfidhLNlZHjFnK5 X-Google-Smtp-Source: AFSGD/Ui54j9967TYNe2oquE5R5aJ4GkO2kjNeuRGagmutnHZlkD/MvxJ7RrbFLq9ICLkS8bqENdjmUcRhC6zagA9RFrrVo+3YEq MIME-Version: 1.0 X-Received: by 2002:a6b:f912:: with SMTP id j18mr8368642iog.36.1544420465586; Sun, 09 Dec 2018 21:41:05 -0800 (PST) Date: Sun, 09 Dec 2018 21:41:05 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003c3d8a057ca46927@google.com> Subject: KASAN: use-after-free Read in neigh_mark_dead From: syzbot To: christian@brauner.io, davem@davemloft.net, dsahern@gmail.com, edumazet@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, roopa@cumulusnetworks.com, syzkaller-bugs@googlegroups.com, w.bumiller@proxmox.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: a60956ed72f7 net: dsa: Make dsa_master_set_mtu() static git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14df67eb400000 kernel config: https://syzkaller.appspot.com/x/.config?x=28ecefa8a6e10719 dashboard link: https://syzkaller.appspot.com/bug?extid=35e87b87c00f386b041f compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1444565d400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123832db400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+35e87b87c00f386b041f@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51 Read of size 8 at addr ffff8881bb7394b0 by task ip/7510 CPU: 0 PID: 7510 Comm: ip Not tainted 4.20.0-rc4+ #335 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51 __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] neigh_mark_dead+0x13b/0x410 net/core/neighbour.c:125 neigh_flush_dev+0x3a1/0x960 net/core/neighbour.c:290 neigh_changeaddr+0x31/0x40 net/core/neighbour.c:319 ndisc_netdev_event+0xe6/0x5b0 net/ipv6/ndisc.c:1770 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1737 call_netdevice_notifiers_extack net/core/dev.c:1749 [inline] call_netdevice_notifiers net/core/dev.c:1763 [inline] dev_set_mac_address+0x293/0x3b0 net/core/dev.c:7775 do_setlink+0x7c7/0x3f30 net/core/rtnetlink.c:2447 __rtnl_newlink+0xcde/0x19e0 net/core/rtnetlink.c:3115 rtnl_newlink+0x6b/0xa0 net/core/rtnetlink.c:3240 rtnetlink_rcv_msg+0x46a/0xc20 net/core/rtnetlink.c:4966 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4984 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1baeb6e320 Code: 02 48 83 c8 ff eb 8d 48 8b 05 14 7b 2a 00 f7 da 64 89 10 48 83 c8 ff eb c9 90 83 3d d5 d2 2a 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e ba 00 00 48 89 04 24 RSP: 002b:00007fff37bc5c58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff37bc9d50 RCX: 00007f1baeb6e320 RDX: 0000000000000000 RSI: 00007fff37bc5c90 RDI: 0000000000000003 RBP: 00007fff37bc5c90 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000000 R11: 0000000000000246 R12: 000000005c0d8897 R13: 0000000000000000 R14: 00000000006395c0 R15: 00007fff37bca530 Allocated by task 22: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15b/0x760 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] kzalloc include/linux/slab.h:741 [inline] neigh_alloc net/core/neighbour.c:375 [inline] ___neigh_create+0x13fc/0x2600 net/core/neighbour.c:553 __neigh_create+0x30/0x40 net/core/neighbour.c:640 ip6_finish_output2+0xa59/0x27a0 net/ipv6/ip6_output.c:117 ip6_finish_output+0x58c/0xc60 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ndisc_send_skb+0x1005/0x1560 net/ipv6/ndisc.c:491 ndisc_send_ns+0x3c6/0x8e0 net/ipv6/ndisc.c:633 addrconf_dad_work+0xbf2/0x1310 net/ipv6/addrconf.c:4081 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 9: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 __rcu_reclaim kernel/rcu/rcu.h:233 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0x1140/0x1ac0 kernel/rcu/tree.c:2697 __do_softirq+0x308/0xb7e kernel/softirq.c:292 The buggy address belongs to the object at ffff8881bb739240 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 624 bytes inside of 1024-byte region [ffff8881bb739240, ffff8881bb739640) The buggy address belongs to the page: page:ffffea0006edce00 count:1 mapcount:0 mapping:ffff8881da800ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0006eb2d88 ffffea0006eea708 ffff8881da800ac0 raw: 0000000000000000 ffff8881bb738040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881bb739380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881bb739400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881bb739480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881bb739500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881bb739580: 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches