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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,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 25313C32792 for ; Mon, 30 Sep 2019 22:39:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE86220842 for ; Mon, 30 Sep 2019 22:39:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729964AbfI3WjR (ORCPT ); Mon, 30 Sep 2019 18:39:17 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:57023 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729109AbfI3WjP (ORCPT ); Mon, 30 Sep 2019 18:39:15 -0400 Received: by mail-io1-f72.google.com with SMTP id a22so33149082ioq.23 for ; Mon, 30 Sep 2019 15:39:15 -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=m8sUaKT7crraQNp1bJulsuqpJCNWCNZ+AvUePawvzjg=; b=Ay4y2boYRqXQiLTnSjs6evcYmBJQ3Ybv/R9BC3nO4idBJBWRZy4KelWhKYDh+2kUMT U18HK8WfZTfi8t7MWTS/dhBP8mR+CdnWl3Q+YxneJgzUxaE2p2Gdg6WABqXEDTF1WNXb 9r2jMGZ9ZysGapi8pbN5JbSqAjn7QJ6YxWw18L4VoqqcUT/b8o0SLMLAkpwS1jJqbYc6 Tv7EGltvD94BC9pBhLivdwrZUNM0qcTmq/eWTxGu24eBwBV7IN0nAQ8Ju6o5A/lgXpCP SuULYpLFE82EGUuzxsxSjw+h/7bfImMjAcDEbcvnWY5FI7qDxuMeKu8I8cEZmH/1mIEV w0Mw== X-Gm-Message-State: APjAAAWfvHo5JNyxO+LpBWKc+7KqYC+Wn0Dtkje7m3hL/2VasnTQObOe hJ0j0xziAYpL/XF/vycsLnmQ+KBRF3yTi+X3aLrHwb9EjJZc X-Google-Smtp-Source: APXvYqy+UvgN4s8+JrV8VP8ug0x2BtZT0z2lXdmmW7i4uJmn+BEVWAHncONEz83/eTP9vll7iKYdSCASMjzUGr71zeOg5T8VJlbj MIME-Version: 1.0 X-Received: by 2002:a5e:8618:: with SMTP id z24mr17197396ioj.67.1569883154531; Mon, 30 Sep 2019 15:39:14 -0700 (PDT) Date: Mon, 30 Sep 2019 15:39:14 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c3ce010593cce73a@google.com> Subject: KMSAN: uninit-value in dvb_usb_device_exit From: syzbot To: glider@google.com, gregkh@linuxfoundation.org, hverkuil-cisco@xs4all.nl, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mail@maciej.szmigiero.name, mchehab@kernel.org, oneukum@suse.com, sean@mess.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de 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: 61ccdad1 Revert "drm/bochs: Use shadow buffer for bochs fr.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=11b7d1ac600000 kernel config: https://syzkaller.appspot.com/x/.config?x=27abc558ecb16a3b dashboard link: https://syzkaller.appspot.com/bug?extid=20a83e47e94e371740d2 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15aff61e600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105a0f22600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+20a83e47e94e371740d2@syzkaller.appspotmail.com input: TeVii S632 USB as /devices/platform/dummy_hcd.0/usb1/1-1/rc/rc0/input5 dvb-usb: schedule remote query interval to 150 msecs. dw2102: su3000_power_ctrl: 0, initialized 1 dvb-usb: TeVii S632 USB successfully initialized and connected. usb 1-1: USB disconnect, device number 2 ================================================================== BUG: KMSAN: uninit-value in strscpy+0x33f/0x4c0 lib/string.c:207 CPU: 0 PID: 3148 Comm: kworker/0:2 Not tainted 5.3.0-rc3+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 strscpy+0x33f/0x4c0 lib/string.c:207 dvb_usb_device_exit+0x1c8/0x270 drivers/media/usb/dvb-usb/dvb-usb-init.c:305 dw2102_disconnect+0x256/0x2a0 drivers/media/usb/dvb-usb/dw2102.c:2446 usb_unbind_interface+0x3a2/0xdd0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1120 [inline] device_release_driver_internal+0x911/0xd20 drivers/base/dd.c:1151 device_release_driver+0x4b/0x60 drivers/base/dd.c:1174 bus_remove_device+0x4bf/0x670 drivers/base/bus.c:556 device_del+0xcd5/0x1d10 drivers/base/core.c:2288 usb_disable_device+0x567/0x1150 drivers/usb/core/message.c:1241 usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199 hub_port_connect drivers/usb/core/hub.c:4949 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x189c/0x2460 kernel/workqueue.c:2417 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline] kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kfree+0x4c1/0x2db0 mm/slub.c:3980 dw2102_probe+0xbd1/0xce0 drivers/media/usb/dvb-usb/dw2102.c:2387 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0x1373/0x1dc0 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x489/0x750 drivers/base/dd.c:882 device_initial_probe+0x4a/0x60 drivers/base/dd.c:929 bus_probe_device+0x131/0x390 drivers/base/bus.c:514 device_add+0x25b5/0x2df0 drivers/base/core.c:2114 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266 really_probe+0x1373/0x1dc0 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x489/0x750 drivers/base/dd.c:882 device_initial_probe+0x4a/0x60 drivers/base/dd.c:929 bus_probe_device+0x131/0x390 drivers/base/bus.c:514 device_add+0x25b5/0x2df0 drivers/base/core.c:2114 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x581d/0x72f0 drivers/usb/core/hub.c:5441 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 ================================================================== --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches