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_HELO_NONE,SPF_PASS autolearn=no 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 21DB6C2D0B1 for ; Fri, 6 Dec 2019 09:31:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 02B062245C for ; Fri, 6 Dec 2019 09:31:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726171AbfLFJbI (ORCPT ); Fri, 6 Dec 2019 04:31:08 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:35668 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726065AbfLFJbI (ORCPT ); Fri, 6 Dec 2019 04:31:08 -0500 Received: by mail-io1-f71.google.com with SMTP id x10so4421860iob.2 for ; Fri, 06 Dec 2019 01:31:07 -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=pK4ZxCKpiJAZoUDvMUbG0xETDdTCbYaw+qcyxpMMxhE=; b=WbMdHppB6d4qVB0IUSeUheUpWb3mnP73nMh4hCYLKeFu5cwTLYN4eboGYU2ZmU/yeC 7WVK7QsQjP0OS+ksYS7EICcY5phaow+I9obILn3pbKJnKD/Kxc4byR+X4VHlU1W4DApi BHf2/zYZF/z2AEwDqA8kHlz2ukrGtqZo0c/h3BrhFUhhkQ2HRypEEssaV9Kav2+hhHE0 7w4wLwPpUOb8eKKuGHAkT/eO8N6UMXg7QM1BKcO14zNj4qzacJOQwQzD4FSVil191q5O cLnoKOoRSkkQA7O39i98l+PANcqeVQhAO9Q6DeGoC9i34aTGwhGxSBOwHTMBuGB4nMZE iV/g== X-Gm-Message-State: APjAAAVkLsRdmesDqgvA7cn9I3Z5uK78uBSws6F57B9TfV4AH+jNGnOA ZO5Y3SKIrLROnIPPAKoHfwR3qu4NQLRKONBElk/a4xIraZKG X-Google-Smtp-Source: APXvYqy95rnuJMV5lS2hLIZWCWb+DeCFrODLR9MKwd92TZONaIkoJH5Q0ZxjeW164xKajVXjxbYGi+TqJkLk+HGr5KmyvCa5JE+5 MIME-Version: 1.0 X-Received: by 2002:a02:aa0c:: with SMTP id r12mr6353295jam.75.1575624667549; Fri, 06 Dec 2019 01:31:07 -0800 (PST) Date: Fri, 06 Dec 2019 01:31:07 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009bd693059905b445@google.com> Subject: KASAN: null-ptr-deref Write in x25_connect From: syzbot To: allison@lohutok.net, andrew.hendry@gmail.com, arnd@arndb.de, davem@davemloft.net, edumazet@google.com, linux-kernel@vger.kernel.org, linux-x25@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, willemb@google.com 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: 9bd19c63 net: emulex: benet: indent a Kconfig depends cont.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=14b858eae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=333b76551307b2a0 dashboard link: https://syzkaller.appspot.com/bug?extid=429c200ffc8772bfe070 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+429c200ffc8772bfe070@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline] BUG: KASAN: null-ptr-deref in refcount_sub_and_test include/linux/refcount.h:253 [inline] BUG: KASAN: null-ptr-deref in refcount_dec_and_test include/linux/refcount.h:281 [inline] BUG: KASAN: null-ptr-deref in x25_neigh_put include/net/x25.h:252 [inline] BUG: KASAN: null-ptr-deref in x25_connect+0x974/0x1020 net/x25/af_x25.c:820 Write of size 4 at addr 00000000000000c8 by task syz-executor.5/32400 CPU: 1 PID: 32400 Comm: syz-executor.5 Not tainted 5.4.0-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 __kasan_report.cold+0x5/0x41 mm/kasan/report.c:510 kasan_report+0x12/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 __kasan_check_write+0x14/0x20 mm/kasan/common.c:98 atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline] refcount_sub_and_test include/linux/refcount.h:253 [inline] refcount_dec_and_test include/linux/refcount.h:281 [inline] x25_neigh_put include/net/x25.h:252 [inline] x25_connect+0x974/0x1020 net/x25/af_x25.c:820 __sys_connect_file+0x25d/0x2e0 net/socket.c:1847 __sys_connect+0x51/0x90 net/socket.c:1860 __do_sys_connect net/socket.c:1871 [inline] __se_sys_connect net/socket.c:1868 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1868 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa58a10ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000000000012 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa58a10f6d4 R13: 00000000004c0f1c R14: 00000000004d4088 R15: 00000000ffffffff ================================================================== --- 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#status for how to communicate with syzbot.