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=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 EC3B2C04E30 for ; Mon, 9 Dec 2019 22:15:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2DDF206D5 for ; Mon, 9 Dec 2019 22:15:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726955AbfLIWPI (ORCPT ); Mon, 9 Dec 2019 17:15:08 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:47304 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726532AbfLIWPI (ORCPT ); Mon, 9 Dec 2019 17:15:08 -0500 Received: by mail-io1-f70.google.com with SMTP id 13so7646277iof.14 for ; Mon, 09 Dec 2019 14:15:08 -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=WeCZI4MD5QWcdvNn2ICJL7eurDPLvZIu0ibe2CDEYBM=; b=ZHM7Cfy+uLwCGjSIwSxmE4zSL/xzWuc6PtKjKK+2vgjP+VW3VtTsUv92x9NdTiUH9U rM588CZA7HQOEEA8hHeDexiV+4IBhswf22uw2SV5PUP0cry0YY3blxnsdB9DiX9PpLIF XL7Wq4jqesUbR2plU1pgWHHS0Syhacx+N7KVknkQH2Q1U89J/MoBDc3f7l1116Hy4DbE XmvI28oD8IPewj+yeb4+0YuvdYb0gFXT5GGAF6lSo9zKJIExK7/Aib3s6dP5dM/MYPXK U3onR/WoDy2bxmWgqzW3pDjInnpUkbbYc2FAUl4zMmSr1WX/l/23ecd4ovKZmvRmTjKC 2Lgg== X-Gm-Message-State: APjAAAVwV3UXpcI0aZUpszJpuHIjD7VklnhsQ0Rxrbn2+NAnUHBwcZqY +4gTDFpFiyxxEwSprI15XQxy4AfJg+ysu2eyEE1rgIXwOLIo X-Google-Smtp-Source: APXvYqzKSFdXBuMvo//ntcSQyXHzLiXLtvIr085VOIgJbrKolHs8IvPr9kmBG+UYD0Q+HsfbSEgvC1q9uvOxS5CxEOuzbmUgCD3P MIME-Version: 1.0 X-Received: by 2002:a02:cc75:: with SMTP id j21mr28768869jaq.113.1575929707669; Mon, 09 Dec 2019 14:15:07 -0800 (PST) Date: Mon, 09 Dec 2019 14:15:07 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006ab7cc05994cbae2@google.com> Subject: KASAN: use-after-free Read in usbvision_v4l2_open From: syzbot To: andreyknvl@google.com, hverkuil@xs4all.nl, jrdr.linux@gmail.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, rfontana@redhat.com, stern@rowland.harvard.edu, 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: 1f22d15c 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=1296f42ae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8ccee2968018adcb dashboard link: https://syzkaller.appspot.com/bug?extid=c7b0ec009a216143df30 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+c7b0ec009a216143df30@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:1043 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x124d/0x1360 kernel/locking/mutex.c:1106 Read of size 8 at addr ffff8881cad4d8b8 by task v4l_id/4526 CPU: 0 PID: 4526 Comm: v4l_id Not tainted 5.4.0-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+0x36/0x50 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:638 __mutex_lock_common kernel/locking/mutex.c:1043 [inline] __mutex_lock+0x124d/0x1360 kernel/locking/mutex.c:1106 usbvision_v4l2_open+0x77/0x340 drivers/media/usb/usbvision/usbvision-video.c:314 v4l2_open+0x20f/0x3d0 drivers/media/v4l2-core/v4l2-dev.c:423 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3412 [inline] path_openat+0x142b/0x4030 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3c0/0x580 fs/open.c:1097 do_syscall_64+0xb7/0x5b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f70d3cab120 Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24 RSP: 002b:00007ffc46d40ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc46d40e08 RCX: 00007f70d3cab120 RDX: 00007f70d3f60138 RSI: 0000000000000000 RDI: 00007ffc46d42f1d RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007ffc46d40e00 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:485 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+0x5c5/0x1f1e 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+0x1480/0x1c20 drivers/base/core.c:2487 usb_set_configuration+0xe67/0x1740 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+0x1480/0x1c20 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 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 3310: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] kasan_set_free_info mm/kasan/common.c:334 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:473 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+0xdc/0x310 mm/slub.c:3957 usbvision_release+0x181/0x1c0 drivers/media/usb/usbvision/usbvision-video.c:1364 usbvision_disconnect+0x171/0x1e0 drivers/media/usb/usbvision/usbvision-video.c:1589 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1134 [inline] device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 device_del+0x481/0xd30 drivers/base/core.c:2664 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 hub_port_connect drivers/usb/core/hub.c:5035 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1753/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881cad4c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6328 bytes inside of 8192-byte region [ffff8881cad4c000, ffff8881cad4e000) The buggy address belongs to the page: page:ffffea00072b5200 refcount:1 mapcount:0 mapping:ffff8881da40c500 index:0x0 compound_mapcount: 0 raw: 0200000000010200 ffffea0007249a00 0000000200000002 ffff8881da40c500 raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cad4d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cad4d800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881cad4d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cad4d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cad4d980: 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.