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_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 1E4F2C10F14 for ; Tue, 16 Apr 2019 11:16:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E291A2075B for ; Tue, 16 Apr 2019 11:16:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729002AbfDPLQH (ORCPT ); Tue, 16 Apr 2019 07:16:07 -0400 Received: from mail-it1-f199.google.com ([209.85.166.199]:51680 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726857AbfDPLQH (ORCPT ); Tue, 16 Apr 2019 07:16:07 -0400 Received: by mail-it1-f199.google.com with SMTP id y127so19071591itb.1 for ; Tue, 16 Apr 2019 04:16:06 -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=8nuO6ldXJk2LHqGy3vCiV7UMltsyhJ7zqhsq6tdPLPM=; b=reQ8VirkCVpILmajXYWLIv2hayOaN82clgP+EniJ6dvLUcCpuVw2j/7v2wF4KSVfsc iGy3ufkqllPti1Nyxb7vnlRFNNjYTbFRYwGf70Hp0lLiSVjeBiuDLc853uJhqdzu5NBd 6VINiFSXeiNncyOsGo/Itjbn9Y0fJonlwwBHphwA4Z5FaD4cIU4y3TBbZYbgVz7hFVnx ZYsTs3yWTtsRsR5DTC5bPKOxuYXog9Vrt/3p6FblqljFXLSXY6VTXWxusURI+sfWvdRZ oU03Mb4U1G6tdI7MbChtrF7zz9iVXvU7O436ZGu76pVjTlI1Zwgph4B5l5sjfO1zyw+q 9FHQ== X-Gm-Message-State: APjAAAVkZNhPpAaFdwCBrLmzpC0JxYgMQAmrRNocacaC7mFSxjXAMwgf 9/Dup5rjLZG3biP4xPZ466Dl6Hq/kw5nA/W1t9AgN8wLzXwl X-Google-Smtp-Source: APXvYqwDWdlk/AxkIdwYO2kbqZWF8p5WnPZhwwskesZzbpejC2AjdaYt7zT3CZ+/cQB7mARZ28bjHqqRUqoaMw9lYXsbNiYrkhfb MIME-Version: 1.0 X-Received: by 2002:a24:9986:: with SMTP id a128mr6487193ite.21.1555413366340; Tue, 16 Apr 2019 04:16:06 -0700 (PDT) Date: Tue, 16 Apr 2019 04:16:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002e03f40586a3e512@google.com> Subject: KASAN: use-after-free Read in cpia2_usb_disconnect From: syzbot To: andreyknvl@google.com, hverkuil-cisco@xs4all.nl, keescook@chromium.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, sakari.ailus@linux.intel.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 9a33b369 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan/tree/usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=1463a267200000 kernel config: https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15 dashboard link: https://syzkaller.appspot.com/bug?extid=0c90fc937c84f97d0aa6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13af9c23200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0c90fc937c84f97d0aa6@syzkaller.appspotmail.com cpia2: Control message failed, err val = -19 cpia2: Message: request = 0x1, start = 0xA9 cpia2: Message: count = 1, register[0] = 0x0 cpia2: Unexpected error: -19 ================================================================== BUG: KASAN: use-after-free in cpia2_usb_disconnect+0x1a9/0x1c0 drivers/media/usb/cpia2/cpia2_usb.c:907 Read of size 8 at addr ffff8880a09f0a58 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc4-319354-g9a33b36 #3 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+0xe8/0x16e lib/dump_stack.c:113 print_address_description+0x6c/0x236 mm/kasan/report.c:187 kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 cpia2_usb_disconnect+0x1a9/0x1c0 drivers/media/usb/cpia2/cpia2_usb.c:907 usb_unbind_interface+0x1c9/0x980 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1082 [inline] device_release_driver_internal+0x436/0x4f0 drivers/base/dd.c:1113 bus_remove_device+0x302/0x5c0 drivers/base/bus.c:556 device_del+0x467/0xb90 drivers/base/core.c:2269 usb_disable_device+0x242/0x790 drivers/usb/core/message.c:1235 usb_disconnect+0x298/0x870 drivers/usb/core/hub.c:2197 hub_port_connect drivers/usb/core/hub.c:4940 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0xcd2/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 12: set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] cpia2_init_camera_struct+0x45/0x110 drivers/media/usb/cpia2/cpia2_core.c:2185 cpia2_usb_probe.cold+0x37/0x45a drivers/media/usb/cpia2/cpia2_usb.c:842 usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361 really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021 generic_probe+0xa2/0xda drivers/usb/core/generic.c:210 usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266 really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 12: set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1429 [inline] slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456 slab_free mm/slub.c:3003 [inline] kfree+0xce/0x290 mm/slub.c:3958 v4l2_device_release drivers/media/v4l2-core/v4l2-device.c:67 [inline] kref_put include/linux/kref.h:67 [inline] v4l2_device_put+0x7e/0xa0 drivers/media/v4l2-core/v4l2-device.c:72 cpia2_usb_disconnect+0x7e/0x1c0 drivers/media/usb/cpia2/cpia2_usb.c:905 usb_unbind_interface+0x1c9/0x980 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1082 [inline] device_release_driver_internal+0x436/0x4f0 drivers/base/dd.c:1113 bus_remove_device+0x302/0x5c0 drivers/base/bus.c:556 device_del+0x467/0xb90 drivers/base/core.c:2269 usb_disable_device+0x242/0x790 drivers/usb/core/message.c:1235 usb_disconnect+0x298/0x870 drivers/usb/core/hub.c:2197 hub_port_connect drivers/usb/core/hub.c:4940 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0xcd2/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a09f0000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2648 bytes inside of 4096-byte region [ffff8880a09f0000, ffff8880a09f1000) The buggy address belongs to the page: page:ffffea0002827c00 count:1 mapcount:0 mapping:ffff88812c3f4600 index:0x0 compound_mapcount: 0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000200 ffff88812c3f4600 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a09f0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a09f0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880a09f0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a09f0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a09f0b00: 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches