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 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 4A5C5C43387 for ; Wed, 2 Jan 2019 11:02:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FA512075B for ; Wed, 2 Jan 2019 11:02:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729615AbfABLCE (ORCPT ); Wed, 2 Jan 2019 06:02:04 -0500 Received: from mail-io1-f69.google.com ([209.85.166.69]:48186 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728578AbfABLCE (ORCPT ); Wed, 2 Jan 2019 06:02:04 -0500 Received: by mail-io1-f69.google.com with SMTP id s3so30107532iob.15 for ; Wed, 02 Jan 2019 03:02:03 -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=am9rJFM0I+ccym52GJ62I79rn0afbZ9ZbMv3LfedKmY=; b=SxlKE4/sr2pdnC596wOCXaMkzqAputdt+fssWH86sRBTGLRTwvgpeayvX2bKuyO6tK RUC4Ei55dWT4HokBlKquvkI8p4VWfiQo4qidHqoDCa1+Vxcu0e6Mp2RvlNjB+N/9xeON XPNiVTee7SqQ1KDANeNJoPHAMQDq0+YEUIw46xIEETr2mjWDlyPGmCSAOOjfXUMd9H4q RSfyYlSAxYL0xAvsX/+k1Iagn+KrSTEeRsuJP7vEbD2RDKggewV1ykJWnIVl6B8ouzv9 thERyoHKtZl6sBoktY/duzC/JNADB54jito3R96+FXhPJ7xGrm48NPb4jtN6L5UERBDV QsoQ== X-Gm-Message-State: AJcUukeZSdVjqFwb4TNESjWEc1NnaVTugehvUmy8IzhXr8B4YgOp4s/Y De0dWy1SEgtMsYwohZ6XBdnhB5fgsCTA+Vj5/Y/2deJs48lE X-Google-Smtp-Source: ALg8bN7pe+EHdgtOMHAOTb34HX8olHyMYGH8SKwJnQz/fkdtskiSUdUwF9M2jrFx8NoLBHCIa8B1M9BKYRDkE4kVghXmteLw0pmg MIME-Version: 1.0 X-Received: by 2002:a5e:a913:: with SMTP id c19mr20993136iod.32.1546426923276; Wed, 02 Jan 2019 03:02:03 -0800 (PST) Date: Wed, 02 Jan 2019 03:02:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006ee231057e779375@google.com> Subject: KASAN: use-after-free Read in x25_write_internal From: syzbot To: andrew.hendry@gmail.com, anto.cardace@gmail.com, davem@davemloft.net, linux-kernel@vger.kernel.org, linux-x25@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, syzkaller-bugs@googlegroups.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: 7418e6520f22 isdn: hisax: hfc_pci: Fix a possible concurre.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=137658e7400000 kernel config: https://syzkaller.appspot.com/x/.config?x=fbee5876573727cd dashboard link: https://syzkaller.appspot.com/bug?extid=426b913e690764e50c83 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+426b913e690764e50c83@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in x25_write_internal+0xded/0xef0 net/x25/x25_subr.c:173 Read of size 4 at addr ffff8880923f6bdc by task syz-executor1/30378 CPU: 0 PID: 30378 Comm: syz-executor1 Not tainted 4.20.0+ #252 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+0x1d3/0x2c6 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 x25_write_internal+0xded/0xef0 net/x25/x25_subr.c:173 x25_release+0x1f8/0x350 net/x25/af_x25.c:660 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 get_signal+0x1558/0x1980 kernel/signal.c:2347 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f959bdb5c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000000000012 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f959bdb66d4 R13: 00000000004be22e R14: 00000000004ce488 R15: 00000000ffffffff Allocated by task 12427: 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 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:546 [inline] x25_link_device_up+0xb2/0x500 net/x25/x25_link.c:249 x25_device_event+0x116/0x2b0 net/x25/af_x25.c:242 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:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] __dev_notify_flags+0x17a/0x480 net/core/dev.c:7605 dev_change_flags+0x109/0x160 net/core/dev.c:7643 dev_ifsioc+0x7da/0xa80 net/core/dev_ioctl.c:237 dev_ioctl+0x1b5/0xcc0 net/core/dev_ioctl.c:488 sock_do_ioctl+0x1f6/0x420 net/socket.c:973 sock_ioctl+0x313/0x690 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30378: 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 x25_neigh_put include/net/x25.h:253 [inline] x25_connect+0xc67/0x1050 net/x25/af_x25.c:823 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880923f6bc0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 28 bytes inside of 256-byte region [ffff8880923f6bc0, ffff8880923f6cc0) The buggy address belongs to the page: page:ffffea000248fd80 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00023d4748 ffffea000267af08 ffff88812c3f07c0 raw: 0000000000000000 ffff8880923f6080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880923f6a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880923f6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880923f6b80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880923f6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880923f6c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. 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