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 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 AD25CC282DD for ; Wed, 8 Jan 2020 20:24:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D8A820643 for ; Wed, 8 Jan 2020 20:24:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726869AbgAHUYL (ORCPT ); Wed, 8 Jan 2020 15:24:11 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:52460 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726149AbgAHUYL (ORCPT ); Wed, 8 Jan 2020 15:24:11 -0500 Received: by mail-io1-f72.google.com with SMTP id d10so2797967iod.19 for ; Wed, 08 Jan 2020 12:24:11 -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=GVyssDLFxQI959y01fNygLsmfKd3ROHK3Ad8toVgtQY=; b=LzkK9JOSTg6YSjCBhbOrvmqypjuCpnxSUBPsDHuZF5DMhIeOT6qb76Yy1BQFQTPNKM ewJeXeG6CGdRqdvt0OYsI8Kpg20H7cBXBwMuXABy0oA6xcpQ/Vw901na9slUzJtvgUpw z7Olm9Ag2Hs3bYEetMHozZkpZR9+WVzHGukAMPwymCB13qddGaxrjl9w2ZtZSpLxl3mn g/ZBpatSYtBIAH61xbSWxdow4P6V0+fMEK9WPXf4YasXwKenzrzIlTmWwaxgtcAVqrYX t+sDuvM1bhXXiLVbr/H9Ql18n5n46wohvEsLGSXRFjaTZf41Wj7qw5VWwdP/H8rj+fT6 jiOA== X-Gm-Message-State: APjAAAVHhcm84m2+aHsBXknvEiYxCteflgSP1czaIGfMnzwlTgnV90Nz 9bTUtUxSsoa1uUWl8IFxHnKB3ff70XLk0WaXIccjgbkvmaua X-Google-Smtp-Source: APXvYqyrzrk7LZE87usAyPXhFDdakLa5pq1NK+nqagWQYrm0vR1eCjRYKJXoTDm/Vum3Zn+GUflvzjFoS5D6SFMcFbRw/Hp1/jcM MIME-Version: 1.0 X-Received: by 2002:a02:9a08:: with SMTP id b8mr5557555jal.1.1578515050611; Wed, 08 Jan 2020 12:24:10 -0800 (PST) Date: Wed, 08 Jan 2020 12:24:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000de50d7059ba6acd5@google.com> Subject: KASAN: use-after-free Read in v4l2_release (3) From: syzbot To: andreyknvl@google.com, bnvandana@gmail.com, hverkuil-cisco@xs4all.nl, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com 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: ae179410 usb: gadget: add raw-gadget interface git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=132aa915e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=57adcee0a60380e2 dashboard link: https://syzkaller.appspot.com/bug?extid=75287f75e2fedd69d680 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+75287f75e2fedd69d680@syzkaller.appspotmail.com usbvision_radio_close: Final disconnect ================================================================== BUG: KASAN: use-after-free in v4l2_release+0x2f1/0x390 drivers/media/v4l2-core/v4l2-dev.c:459 Read of size 4 at addr ffff8881d13b5068 by task v4l_id/20136 CPU: 1 PID: 20136 Comm: v4l_id Not tainted 5.5.0-rc3-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+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x16/0x200 mm/kasan/report.c:374 __kasan_report.cold+0x37/0x7f mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:639 v4l2_release+0x2f1/0x390 drivers/media/v4l2-core/v4l2-dev.c:459 __fput+0x2d7/0x840 fs/file_table.c:280 task_work_run+0x13f/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4e0/0x5c0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f70446a32b0 Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24 RSP: 002b:00007ffee1722fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f70446a32b0 RDX: 0000000000000013 RSI: 0000000080685600 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007ffee1723130 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 14633: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:670 [inline] usbvision_alloc drivers/media/usb/usbvision/usbvision-video.c:1315 [inline] usbvision_probe.cold+0x5c5/0x1f21 drivers/media/usb/usbvision/usbvision-video.c:1469 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x141f/0x1bc0 drivers/base/core.c:2487 usb_set_configuration+0xe38/0x16c0 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x141f/0x1bc0 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 process_scheduled_works kernel/workqueue.c:2326 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2412 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 20136: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x129/0x170 mm/kasan/common.c:474 slab_free_hook mm/slub.c:1425 [inline] slab_free_freelist_hook mm/slub.c:1458 [inline] slab_free mm/slub.c:3005 [inline] kfree+0xda/0x310 mm/slub.c:3957 usbvision_release+0x181/0x1c0 drivers/media/usb/usbvision/usbvision-video.c:1364 usbvision_radio_close.cold+0x2b/0x74 drivers/media/usb/usbvision/usbvision-video.c:1130 v4l2_release+0x2e7/0x390 drivers/media/v4l2-core/v4l2-dev.c:455 __fput+0x2d7/0x840 fs/file_table.c:280 task_work_run+0x13f/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4e0/0x5c0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881d13b4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4200 bytes inside of 8192-byte region [ffff8881d13b4000, ffff8881d13b6000) The buggy address belongs to the page: page:ffffea000744ec00 refcount:1 mapcount:0 mapping:ffff8881da40c500 index:0x0 compound_mapcount: 0 raw: 0200000000010200 ffffea0007392a00 0000000300000003 ffff8881da40c500 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d13b4f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d13b4f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d13b5000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d13b5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d13b5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.