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=-0.4 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 3B044C43382 for ; Wed, 26 Sep 2018 15:44:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E92932151D for ; Wed, 26 Sep 2018 15:44:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E92932151D 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 vger.kernel.org via listexpand id S1728474AbeIZV5g (ORCPT ); Wed, 26 Sep 2018 17:57:36 -0400 Received: from mail-it1-f200.google.com ([209.85.166.200]:58635 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728304AbeIZV5g (ORCPT ); Wed, 26 Sep 2018 17:57:36 -0400 Received: by mail-it1-f200.google.com with SMTP id d194-v6so3789571itb.8 for ; Wed, 26 Sep 2018 08:44:04 -0700 (PDT) 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=TQJLVzgnyMsensxVEyerg63hILZyTk6dmDoI5UGc2Z0=; b=DAtYubfur88s8BAgHDmoiNJyey4stwNYKyYR9f7rmj8tiSQHY60mWcRXvjTEDeYHdZ u9MokzDW7fu3Kxe64mL6wBWn7yy0K3g3JPrKa1vf1fIPx4PPQzKx8GXAvGx5MCL9dR4c E1pMqCcjBUBNqWGGdFqSYPLtZ61qxBGot6K+QVIEcH9rc8jusUw9RLihxFyZ/xPiml0M MuTbdUMTtfZrwa3/kwskMs10DDBuRa+Tu7k1h58pNxbYZFmFv+/QwGiEUocUaFyhJYWF /l37FEa2OV2rMcYnxh/LnlykifReSazVbgR6fZTUo8K6p2C2kef6seeDxc8BBlGlMpOo 3P5Q== X-Gm-Message-State: ABuFfog5ZoGb0pWGeoN0BzWJ/Gs8/jbVzGaMXZjmjzcMD5sYLr7dA7cY Af6LuQOdra5Z8diDElfGh+gZzXdOn8+xP6zn7XLFtPgunqqo X-Google-Smtp-Source: ACcGV62KC9ig5arQTYpmFQt6GJ9jhs+CuFQSxJu9BV9a9M5DDbs3Prg99b0wtZ9iNTmcxjlH6jQyyhNYDpCsdhUeYykTjGAZtGQt MIME-Version: 1.0 X-Received: by 2002:a6b:8d94:: with SMTP id p142-v6mr4467964iod.25.1537976643671; Wed, 26 Sep 2018 08:44:03 -0700 (PDT) Date: Wed, 26 Sep 2018 08:44:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000084e2450576c817cc@google.com> Subject: KASAN: use-after-free Read in tcf_block_find From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.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: 4b1bd6976945 net: phy: marvell: Fix build. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=16f763fa400000 kernel config: https://syzkaller.appspot.com/x/.config?x=443816db871edd66 dashboard link: https://syzkaller.appspot.com/bug?extid=37b8770e6d5a8220a039 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a5614e400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=141a532a400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+37b8770e6d5a8220a039@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 ================================================================== BUG: KASAN: use-after-free in tcf_block_find+0x9d1/0xb90 net/sched/cls_api.c:646 Read of size 4 at addr ffff8801cc126978 by task syz-executor002/5646 CPU: 1 PID: 5646 Comm: syz-executor002 Not tainted 4.19.0-rc5+ #232 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 tcf_block_find+0x9d1/0xb90 net/sched/cls_api.c:646 tc_new_tfilter+0x497/0x1d20 net/sched/cls_api.c:1331 rtnetlink_rcv_msg+0x46a/0xc20 net/core/rtnetlink.c:4730 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2447 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4748 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:1901 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: 0033:0x441979 Code: e8 0c ac 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 04 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd8b1e9178 EFLAGS: 00000213 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441979 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 0000000000009641 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000001bb6880 R11: 0000000000000213 R12: 0000000000000000 R13: 0000000000402390 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5522: 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_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kzalloc_node include/linux/slab.h:718 [inline] qdisc_alloc+0x10f/0xb50 net/sched/sch_generic.c:820 qdisc_create_dflt+0x7a/0x1e0 net/sched/sch_generic.c:894 attach_one_default_qdisc net/sched/sch_generic.c:1041 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2114 [inline] attach_default_qdiscs net/sched/sch_generic.c:1060 [inline] dev_activate+0x82f/0xcb0 net/sched/sch_generic.c:1103 __dev_open+0x2cb/0x410 net/core/dev.c:1400 __dev_change_flags+0x730/0x9b0 net/core/dev.c:7448 dev_change_flags+0x89/0x150 net/core/dev.c:7517 do_setlink+0xb5f/0x3f20 net/core/rtnetlink.c:2441 rtnl_newlink+0x136f/0x1d40 net/core/rtnetlink.c:3054 rtnetlink_rcv_msg+0x46a/0xc20 net/core/rtnetlink.c:4730 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2447 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4748 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:1901 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 Freed by task 0: 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:3813 qdisc_free+0x89/0x100 net/sched/sch_generic.c:941 qdisc_free_cb+0x19/0x20 net/sched/sch_generic.c:948 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2576 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline] rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864 __do_softirq+0x30b/0xad8 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801cc126940 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 56 bytes inside of 1024-byte region [ffff8801cc126940, ffff8801cc126d40) The buggy address belongs to the page: page:ffffea0007304980 count:1 mapcount:0 mapping:ffff8801da800ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0007304808 ffffea0007302788 ffff8801da800ac0 raw: 0000000000000000 ffff8801cc126040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cc126800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801cc126880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801cc126900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801cc126980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cc126a00: 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