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 0C189C43381 for ; Thu, 21 Feb 2019 14:46:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE4E820700 for ; Thu, 21 Feb 2019 14:46:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729591AbfBUOqF (ORCPT ); Thu, 21 Feb 2019 09:46:05 -0500 Received: from mail-it1-f198.google.com ([209.85.166.198]:50900 "EHLO mail-it1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729414AbfBUOqE (ORCPT ); Thu, 21 Feb 2019 09:46:04 -0500 Received: by mail-it1-f198.google.com with SMTP id i63so15621077itb.0 for ; Thu, 21 Feb 2019 06:46:03 -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=F22SMaJMRktFDJHMPzJ0Z7M16i2I1d0UhPWvABaYDWo=; b=ohTO5ePWFIKypuTcWuan89Z2x++oSFkK9t1ND83EusTJM6hsGIKVKyyF2JS6p+2fMA CR+ir5RTwcH/DpUS5+cxQfdtGsXJ4LTXDOm4aXMKemd8s30oExnsBOUC1FsQfVNqzpoK dCu/ycHIHx1SY2KoWEaGEGthrj653ojVobPJzCpTzIfSlFoFwfLJaA6pLVhx8yHtRzR/ eOzRiacoUPG/OOZnwyWH5zHxnFXspg4dQomwqbnOrAtG15fMUGQMolk1Lquq9kbcnfx6 HEzCR/R29qZ1VWaUq2lEpcv/FQRoWLmgchvDzpk5j8PHuFrepy42TbWhJziKsAF2ucr5 1vUA== X-Gm-Message-State: AHQUAubQZaZa8AoJXg0DSnacjlQ+KvAfmV1UiIESr+Kn0RHCLjcX0nKk rDjUxQKnF+BNZ0EuXwJjblxr4cVDNevHJcqkkiHgkt2X7Pdc X-Google-Smtp-Source: AHgI3IbkPE3klgB5a6ktBYeeYAOSsR8YbDeOEORF6dwDSBfAcOOuxIqLaeBN0sAUA/XdG9HY1Jtm1ZShPPsiTkZuc5SIBNGGl3xr MIME-Version: 1.0 X-Received: by 2002:a24:d083:: with SMTP id m125mr9308760itg.5.1550760363278; Thu, 21 Feb 2019 06:46:03 -0800 (PST) Date: Thu, 21 Feb 2019 06:46:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000095c8f005826888fd@google.com> Subject: general protection fault in dev_get_by_index_rcu From: syzbot To: davem@davemloft.net, 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: c433570458e4 ax25: fix a use-after-free in ax25_fillin_cb() git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=1352f84b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4b137b8ba637eb77 dashboard link: https://syzkaller.appspot.com/bug?extid=48127bec5a5cd81411e3 compiler: gcc (GCC) 8.0.1 20180413 (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+48127bec5a5cd81411e3@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3229 Comm: syz-executor0 Not tainted 4.20.0+ #255 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dev_get_by_index_rcu+0x9a/0x360 net/core/dev.c:840 Code: f2 c7 40 0c 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 64 82 5f fb 48 8d bb c0 01 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 7e 02 00 00 0f b6 85 34 ff ff ff 48 8b 93 c0 RSP: 0018:ffff8880ae706c50 EFLAGS: 00010207 RAX: 001ffffffffbd5e1 RBX: 00ffffffffdead4e RCX: ffffffff8697b590 RDX: 0000000000000100 RSI: ffffffff8622238c RDI: 00ffffffffdeaf0e RBP: ffff8880ae706d30 R08: ffff888060b26340 R09: ffffed1015ce5b8f R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88806556b6f0 R15: ffff88808e08b95d FS: 00007eff2e401700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb2c000 CR3: 000000008a036000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: netif_index_is_l3_master include/net/l3mdev.h:138 [inline] ip_send_unicast_reply+0x10fd/0x1740 net/ipv4/ip_output.c:1588 tcp_v4_send_reset+0x14be/0x2ae0 net/ipv4/tcp_ipv4.c:775 tcp_v4_rcv+0x1dfa/0x3b10 net/ipv4/tcp_ipv4.c:1936 ip_protocol_deliver_rcu+0xb6/0xa20 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x234/0x380 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xed/0x600 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5083 process_backlog+0x217/0x760 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x7c5/0x1950 net/core/dev.c:6412 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 do_softirq.part.13+0x126/0x160 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x21d/0x260 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline] ip_finish_output2+0xabc/0x1a20 net/ipv4/ip_output.c:231 ip_finish_output+0x7f7/0xf90 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x217/0x8d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 __ip_queue_xmit+0x9af/0x1f40 net/ipv4/ip_output.c:505 ip_queue_xmit+0x56/0x70 include/net/ip.h:198 __tcp_transmit_skb+0x1b9f/0x3b90 net/ipv4/tcp_output.c:1160 tcp_transmit_skb net/ipv4/tcp_output.c:1176 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3495 [inline] tcp_connect+0x2271/0x4690 net/ipv4/tcp_output.c:3534 tcp_v4_connect+0x19bb/0x1df0 net/ipv4/tcp_ipv4.c:315 __inet_stream_connect+0x992/0x1150 net/ipv4/af_inet.c:655 tcp_sendmsg_fastopen net/ipv4/tcp.c:1161 [inline] tcp_sendmsg_locked+0x2890/0x3f30 net/ipv4/tcp.c:1208 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1443 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007eff2e400c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 00000000200002c0 R09: 0000000000000010 R10: 00000400200007fe R11: 0000000000000246 R12: 00007eff2e4016d4 R13: 00000000004c5278 R14: 00000000004d8b90 R15: 00000000ffffffff Modules linked in: ---[ end trace 67e073c62a96b1a3 ]--- RIP: 0010:dev_get_by_index_rcu+0x9a/0x360 net/core/dev.c:840 Code: f2 c7 40 0c 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 64 82 5f fb 48 8d bb c0 01 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 7e 02 00 00 0f b6 85 34 ff ff ff 48 8b 93 c0 RSP: 0018:ffff8880ae706c50 EFLAGS: 00010207 RAX: 001ffffffffbd5e1 RBX: 00ffffffffdead4e RCX: ffffffff8697b590 RDX: 0000000000000100 RSI: ffffffff8622238c RDI: 00ffffffffdeaf0e RBP: ffff8880ae706d30 R08: ffff888060b26340 R09: ffffed1015ce5b8f R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88806556b6f0 R15: ffff88808e08b95d FS: 00007eff2e401700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb2c000 CR3: 000000008a036000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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.