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=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 1A0B9C282C4 for ; Tue, 12 Feb 2019 19:04:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8EFC222C0 for ; Tue, 12 Feb 2019 19:04:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731722AbfBLTEa (ORCPT ); Tue, 12 Feb 2019 14:04:30 -0500 Received: from mail-it1-f199.google.com ([209.85.166.199]:56840 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729799AbfBLTE2 (ORCPT ); Tue, 12 Feb 2019 14:04:28 -0500 Received: by mail-it1-f199.google.com with SMTP id 135so6536651itb.6 for ; Tue, 12 Feb 2019 11:04:27 -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=j4m67u9Q6Lbqw7auO4quv5CiDJozGXR7zgVeB7tlhlE=; b=VJVPy/PDlc/gsqfmOi7Yrjm4UNiyR+kucbRSZoBxGutQoH6FmHNXR/Myck68t8Wb+W I5G4SoSrt+QeiDKZdnuCdcdvmvxGqEMv1THpjeJwiDDcthEMpb9OCm2wpTf8A/dDP82O 6jWZysNgBeCA58NPu+bfo7rh/I2kVVPprUX7xWZQjXL8bGWyUqrexpmGFF49Zk7A69IF cyEInPXkendv7+8l5wwcdOWdAutPGQ8XC3+Rpo8WTmUVOtTdKL/utcb3UIYUSLgPxafR IHBQOVkV50uAsV7fviEYioAxAolL9BDAh+tFF9pt/ce6E5LAxM+M0sS2fLqh7xaypP4B 37Ow== X-Gm-Message-State: AHQUAuY1AOgBtEsKrPqtRF9WGqTV9TloRPL96HyPqrq6C+8vyOE3IuRs CNQgR9Pyyu63ok2Y+jdyFc368PvFOLAxQRXl35OD7GtwjYmg X-Google-Smtp-Source: AHgI3IZiUKM1VFoBClcvJSz7E0lhxj7RqZQxGxvvTVio3DIlhLFlFiKMyWQs7vr7JtDyz8YHPTawqB8cOTM5hBo4dYtAVXzsOsai MIME-Version: 1.0 X-Received: by 2002:a24:3a14:: with SMTP id m20mr201559itm.1.1549998267303; Tue, 12 Feb 2019 11:04:27 -0800 (PST) Date: Tue, 12 Feb 2019 11:04:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002015db0581b71858@google.com> Subject: KASAN: use-after-free Read in sctp_outq_tail From: syzbot To: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, vyasevich@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: d4104460aec1 Add linux-next specific files for 20190211 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14140124c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c8a112d3b0d6719b dashboard link: https://syzkaller.appspot.com/bug?extid=7823fa3f3e2d69341ea8 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+7823fa3f3e2d69341ea8@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in list_add_tail include/linux/list.h:93 [inline] BUG: KASAN: use-after-free in sctp_outq_tail_data net/sctp/outqueue.c:105 [inline] BUG: KASAN: use-after-free in sctp_outq_tail+0x816/0x930 net/sctp/outqueue.c:313 Read of size 8 at addr ffff88807b19a7b8 by task syz-executor.0/30745 CPU: 1 PID: 30745 Comm: syz-executor.0 Not tainted 5.0.0-rc5-next-20190211 #32 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+0x172/0x1f0 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:132 list_add_tail include/linux/list.h:93 [inline] sctp_outq_tail_data net/sctp/outqueue.c:105 [inline] sctp_outq_tail+0x816/0x930 net/sctp/outqueue.c:313 sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1109 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1784 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x68e/0x5380 net/sctp/sm_sideeffect.c:1191 sctp_primitive_SEND+0xa0/0xd0 net/sctp/primitive.c:178 sctp_sendmsg_to_asoc+0xa63/0x17b0 net/sctp/socket.c:1955 sctp_sendmsg+0x10a9/0x17e0 net/sctp/socket.c:2113 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x806/0x930 net/socket.c:2136 __sys_sendmsg+0x105/0x1d0 net/socket.c:2174 __do_sys_sendmsg net/socket.c:2183 [inline] __se_sys_sendmsg net/socket.c:2181 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2181 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa9b8630c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa9b86316d4 R13: 00000000004c4e2b R14: 00000000004d8ab8 R15: 00000000ffffffff Allocated by task 30745: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:498 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:471 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:506 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615 kmalloc include/linux/slab.h:548 [inline] kzalloc include/linux/slab.h:743 [inline] sctp_stream_init_ext+0x51/0x110 net/sctp/stream.c:172 sctp_sendmsg_to_asoc+0x1273/0x17b0 net/sctp/socket.c:1896 sctp_sendmsg+0x10a9/0x17e0 net/sctp/socket.c:2113 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x806/0x930 net/socket.c:2136 __sys_sendmsg+0x105/0x1d0 net/socket.c:2174 __do_sys_sendmsg net/socket.c:2183 [inline] __se_sys_sendmsg net/socket.c:2181 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2181 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30745: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:460 kasan_slab_free+0xe/0x10 mm/kasan/common.c:468 __cache_free mm/slab.c:3491 [inline] kfree+0xcf/0x230 mm/slab.c:3816 sctp_stream_outq_migrate+0x3e6/0x540 net/sctp/stream.c:88 sctp_stream_init+0xbc/0x410 net/sctp/stream.c:139 sctp_process_init+0x21c3/0x2b20 net/sctp/sm_make_chunk.c:2466 sctp_cmd_process_init net/sctp/sm_sideeffect.c:682 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1410 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x3145/0x5380 net/sctp/sm_sideeffect.c:1191 sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1074 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x196/0xbe0 net/sctp/input.c:354 sk_backlog_rcv include/net/sock.h:937 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2379 release_sock+0x59/0x1c0 net/core/sock.c:2895 sctp_wait_for_connect+0x316/0x540 net/sctp/socket.c:8998 sctp_sendmsg_to_asoc+0x13e3/0x17b0 net/sctp/socket.c:1967 sctp_sendmsg+0x10a9/0x17e0 net/sctp/socket.c:2113 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x806/0x930 net/socket.c:2136 __sys_sendmsg+0x105/0x1d0 net/socket.c:2174 __do_sys_sendmsg net/socket.c:2183 [inline] __se_sys_sendmsg net/socket.c:2181 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2181 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88807b19a780 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 56 bytes inside of 96-byte region [ffff88807b19a780, ffff88807b19a7e0) The buggy address belongs to the page: page:ffffea0001ec6680 count:1 mapcount:0 mapping:ffff88812c3f04c0 index:0xffff88807b19a800 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000262acc8 ffffea0001448348 ffff88812c3f04c0 raw: ffff88807b19a800 ffff88807b19a000 000000010000001d 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807b19a680: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88807b19a700: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc > ffff88807b19a780: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807b19a800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88807b19a880: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== --- 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.