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=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 2D3D7C4321A for ; Tue, 11 Jun 2019 07:17:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0ACE92086D for ; Tue, 11 Jun 2019 07:17:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404197AbfFKHRG (ORCPT ); Tue, 11 Jun 2019 03:17:06 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:51239 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403936AbfFKHRF (ORCPT ); Tue, 11 Jun 2019 03:17:05 -0400 Received: by mail-io1-f70.google.com with SMTP id c5so9255240iom.18 for ; Tue, 11 Jun 2019 00:17:05 -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=QjZO4tpNW3xfQ7G62g/3e8FGmq0plm8GqMkIHwnW2ss=; b=QpLpGKrg8Uh5QnHPbZHiKAVEaEiwrMXsySwZIUduwPIFoEAyL5w5B7Gl/QHGUMsoTZ TyOjIiusTgsT7o0XNvFduH255EeKNkN7bYGTO2ZS5+t0BkLWSPAzCCpji4SgHx2T4pSr CJGcLXTgJRZbyHIWww+IXce1r9aDcJ19KM/qRZ5VaeafzUMHybj8K6Wih8UEFR7xKl1k eYvXx2aV3LxgNCpSDdqzKyMYw9TO2iZN2r6poQFcg8Asd2Rj+Opx2Nfk9rZAUMDICu8e Ok9YUbm5i5lC5CTuSvyHKZb2p4Gi2LJnOawykMGkGWcMCgcBaPZCR8mx/EFfYU0GUVYt TVzQ== X-Gm-Message-State: APjAAAW8yc9g2Nc76YXgIDUc+WpMnFho73a4JRvYq/wgH5rSJTMqcs+B A2o2oaDQ4tg/Pz6qnC///Wb5J0b/LqZ0AdBg0eFMxEiHi4/w X-Google-Smtp-Source: APXvYqwQezJk91zRFz6a6YDfa+lnroxvsrETeBHfG7tYh5e1W7/oZ+Y5SGs9hTUEPrRoXRgDP4pWjntKridoWafqjBSebc+La7Hj MIME-Version: 1.0 X-Received: by 2002:a02:1948:: with SMTP id b69mr26512965jab.55.1560237425090; Tue, 11 Jun 2019 00:17:05 -0700 (PDT) Date: Tue, 11 Jun 2019 00:17:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007ce6f5058b0715ea@google.com> Subject: KASAN: null-ptr-deref Read 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, ms@dev.tdt.de, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de 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: f4cfcfbd net: dsa: sja1105: Fix link speed not working at .. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=16815cd2a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4f721a391cd46ea dashboard link: https://syzkaller.appspot.com/bug?extid=777a2aab6ffd397407b5 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+777a2aab6ffd397407b5@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: null-ptr-deref in refcount_sub_and_test_checked+0x87/0x200 lib/refcount.c:182 Read of size 4 at addr 00000000000000c8 by task syz-executor.2/16959 CPU: 0 PID: 16959 Comm: syz-executor.2 Not tainted 5.2.0-rc2+ #40 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 __kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:94 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] refcount_sub_and_test_checked+0x87/0x200 lib/refcount.c:182 refcount_dec_and_test_checked+0x1b/0x20 lib/refcount.c:220 x25_neigh_put include/net/x25.h:252 [inline] x25_connect+0x8d8/0xea0 net/x25/af_x25.c:820 __sys_connect+0x264/0x330 net/socket.c:1840 __do_sys_connect net/socket.c:1851 [inline] __se_sys_connect net/socket.c:1848 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1848 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f09776b4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000000000012 RSI: 0000000020000280 RDI: 0000000000000004 RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09776b56d4 R13: 00000000004bf854 R14: 00000000004d0e08 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.