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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 E41BDFA3728 for ; Thu, 17 Oct 2019 01:42:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B598621A49 for ; Thu, 17 Oct 2019 01:42:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405310AbfJQBmq (ORCPT ); Wed, 16 Oct 2019 21:42:46 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:48233 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390862AbfJQBmL (ORCPT ); Wed, 16 Oct 2019 21:42:11 -0400 Received: by mail-io1-f69.google.com with SMTP id w16so919471ioc.15 for ; Wed, 16 Oct 2019 18:42:11 -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=WNUnDvR5EW3ljzuYUx0+ZKXpfmH7/fL3zE89YTfdpUM=; b=HS1sfOMUngTsG6jBWRDX1GrzJveqpfIQp9iJxBtzntC3lhGLAGJL41T6VCCIYg4iLs WfiVjI+mDiYNacm6Azc8pug0dLBZJDy9FAX/tdttfm+zyo86pxP7Q2DgV3hgY7zWytrT nOJ7HYcxyR6/frJY2Bd2G7NVaLvKz+gQuUjM++HwcemeEa9wmgY+AikQ4+I+1aHni2ND 9mVwIE2QKn2sOQ+KDKXSi4fsDTMvAKFe3dPrfCYlMNIELneP1g54QTl0nqQSEYdEhUt6 LsfzMoyoZI2pMJEtRhx1sNsdx9MlqrM9GloIsxl0f4/YllYT8IlDjejlBm+4M78aJPjD C17g== X-Gm-Message-State: APjAAAW5Fu/3qjj8iySsw7x6qs9RYSndCzy40214omZn75ZL8gsv1vhL Y+0MWsM28ymmrU8ppyp6TX3cM5XxmlARxaKbgBHzSshijL7z X-Google-Smtp-Source: APXvYqzTwoDne4FjrmzPziIVvWHqUl67fjnOFKAkWPuPDGb88XbHnamy7va4mKsvFC3HHQGTepYm0HvajTYZ0fAwXCOtTGoYtd+O MIME-Version: 1.0 X-Received: by 2002:a02:cd8e:: with SMTP id l14mr984070jap.30.1571276530724; Wed, 16 Oct 2019 18:42:10 -0700 (PDT) Date: Wed, 16 Oct 2019 18:42:10 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007536530595115304@google.com> Subject: KMSAN: uninit-value in read_sensor_register (2) From: syzbot To: allison@lohutok.net, glider@google.com, gregkh@linuxfoundation.org, hverkuil@xs4all.nl, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, swinslow@gmail.com, 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: c2453450 kmsan: kcov: prettify the code unpoisoning area->.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=14c95fe7600000 kernel config: https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a dashboard link: https://syzkaller.appspot.com/bug?extid=64437af5c781a7f0e08e compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15e1a3a0e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119f406b600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+64437af5c781a7f0e08e@syzkaller.appspotmail.com usb 1-1: New USB device found, idVendor=0ac8, idProduct=c301, bcdDevice=8b.4c usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? gspca_main: vc032x-2.14.0 probing 0ac8:c301 gspca_vc032x: reg_w err -71 ===================================================== BUG: KMSAN: uninit-value in read_sensor_register+0x4b7/0xd30 drivers/media/usb/gspca/vc032x.c:2971 CPU: 1 PID: 3904 Comm: kworker/1:2 Not tainted 5.4.0-rc3+ #0 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+0x14a/0x2f0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245 read_sensor_register+0x4b7/0xd30 drivers/media/usb/gspca/vc032x.c:2971 vc032x_probe_sensor drivers/media/usb/gspca/vc032x.c:3032 [inline] sd_init+0x2cf3/0x4530 drivers/media/usb/gspca/vc032x.c:3163 gspca_dev_probe2+0xe93/0x2230 drivers/media/usb/gspca/gspca.c:1532 gspca_dev_probe+0x346/0x3b0 drivers/media/usb/gspca/gspca.c:1605 sd_probe+0x8d/0xa0 drivers/media/usb/gspca/gl860/gl860.c:511 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline] kmsan_internal_poison_shadow+0x60/0x110 mm/kmsan/kmsan.c:133 kmsan_slab_alloc+0xaa/0x130 mm/kmsan/kmsan_hooks.c:101 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2801 [inline] kmem_cache_alloc_trace+0x8c5/0xd20 mm/slub.c:2818 kmalloc include/linux/slab.h:556 [inline] gspca_dev_probe2+0x30d/0x2230 drivers/media/usb/gspca/gspca.c:1464 gspca_dev_probe+0x346/0x3b0 drivers/media/usb/gspca/gspca.c:1605 sd_probe+0x8d/0xa0 drivers/media/usb/gspca/gl860/gl860.c:511 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 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