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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74F1BC00140 for ; Mon, 8 Aug 2022 07:54:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241855AbiHHHy0 (ORCPT ); Mon, 8 Aug 2022 03:54:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235426AbiHHHyX (ORCPT ); Mon, 8 Aug 2022 03:54:23 -0400 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 242CB11C29 for ; Mon, 8 Aug 2022 00:54:23 -0700 (PDT) Received: by mail-io1-f71.google.com with SMTP id w6-20020a6bf006000000b006845b59a08bso2597331ioc.9 for ; Mon, 08 Aug 2022 00:54:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc; bh=M1aIXwZE6mKX2bgj5k34xKzHGwgUSygSNxNpylwHFFk=; b=ViunAey/H95k71prSy51yCrQYAIPmqe1p2e7PGvI9kCBGF8egoFARpkxHdbvKz8LqZ e0C2QsO/fjjQwPxFDw/yDb1iC2fabkf9zFqjzbLtFciABN+7rSZygmcRcV+7NlKwwtAH wXACZKr4u3/yf7qZ3EI0uAj8hvvg7LXOAxQDxvTi8bS2ktjiS68x4sZPKInpJ3P8zoM1 spVEZ0qC4pjdyFBf0akmzwB7z7WZC1xYWAwh39RCc7xkAzdLNO7yvrc1EIjKsl7BRDVI AmiOId5tsZ6RIZwRm8/ZCJI7fnSrr/+Q8Etj/zbGkY0gGjTi9p8mNVvEB2+oJo8Y230d 9Pbw== X-Gm-Message-State: ACgBeo26Ux5GyU06NFewzDm6+XWmiWeY6gofhABnZW/4VmThc1c5EA1v cMmQXB6PSvTp4u6WRW1xJ5scr75b0kw2IoFi5zYoWSleohZ2 X-Google-Smtp-Source: AA6agR53NZcATyFBBYB6OHl3SfTojv3wtZnYEKkX+K47WxS4FIereD7KqTjPaaCea7ThHoauzo3OxuQ66G++rfMVsMilYHDhC8iq MIME-Version: 1.0 X-Received: by 2002:a05:6e02:216a:b0:2df:947e:2318 with SMTP id s10-20020a056e02216a00b002df947e2318mr5680117ilv.220.1659945262460; Mon, 08 Aug 2022 00:54:22 -0700 (PDT) Date: Mon, 08 Aug 2022 00:54:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b7352e05e5b61f84@google.com> Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in gsmld_receive_buf From: syzbot To: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: ca688bff68bc Add linux-next specific files for 20220808 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1562df51080000 kernel config: https://syzkaller.appspot.com/x/.config?x=4c20e006003cdecb dashboard link: https://syzkaller.appspot.com/bug?extid=e3563f0c94e188366dbb compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e3563f0c94e188366dbb@syzkaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 7b32a067 P4D 7b32a067 PUD 7e135067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4273 Comm: syz-executor.0 Not tainted 5.19.0-next-20220808-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000c3a7cf0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff888041a85000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000007d RDI: ffff888041a85000 RBP: ffffc9000c3a7da1 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffffc9000c3a7d90 R15: dffffc0000000000 FS: 00007f58156b4700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000025ca1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 tiocsti drivers/tty/tty_io.c:2293 [inline] tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5814489279 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f58156b4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f581459bf80 RCX: 00007f5814489279 RDX: 0000000020000280 RSI: 0000000000005412 RDI: 0000000000000003 RBP: 00007f58144e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1f199d5f R14: 00007f58156b4300 R15: 0000000000022000 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000c3a7cf0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff888041a85000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000007d RDI: ffff888041a85000 RBP: ffffc9000c3a7da1 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffffc9000c3a7d90 R15: dffffc0000000000 FS: 00007f58156b4700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000025ca1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.