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Mon, 30 Sep 2019 15:39:15 -0700 (PDT) Date: Mon, 30 Sep 2019 15:39:15 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d4e4900593cce75d@google.com> Subject: KASAN: use-after-free Read in mcba_usb_disconnect From: syzbot To: andreyknvl@google.com, gregkh@linuxfoundation.org, gustavo@embeddedor.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 2994c077 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=173b5acd600000 kernel config: https://syzkaller.appspot.com/x/.config?x=69ddefac6929256a dashboard link: https://syzkaller.appspot.com/bug?extid=e29b17e5042bbc56fae9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10ec8e19600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107ad813600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e29b17e5042bbc56fae9@syzkaller.appspotmail.com mcba_usb 1-1:0.180 can1: Failed to send cmd (169) mcba_usb 1-1:0.180: Microchip CAN BUS Analyzer connected usb 1-1: USB disconnect, device number 2 mcba_usb 1-1:0.95 can0: device disconnected ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3377/0x3eb0 kernel/locking/lockdep.c:3828 Read of size 8 at addr ffff8881d2e98f48 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0+ #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+0xca/0x13e lib/dump_stack.c:113 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/0x12 mm/kasan/common.c:634 __lock_acquire+0x3377/0x3eb0 kernel/locking/lockdep.c:3828 lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4487 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167 spin_lock_irq include/linux/spinlock.h:363 [inline] usb_kill_anchored_urbs+0x1e/0x110 drivers/usb/core/urb.c:787 mcba_urb_unlink drivers/net/can/usb/mcba_usb.c:711 [inline] mcba_usb_disconnect+0xd6/0xe4 drivers/net/can/usb/mcba_usb.c:881 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+0x420/0xb10 drivers/base/core.c:2375 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x8d0 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+0x1454/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 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 page: page:ffffea00074ba600 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 flags: 0x200000000000000() raw: 0200000000000000 ffffea0007479208 ffff88821fffac18 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d2e98e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881d2e98e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8881d2e98f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881d2e98f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881d2e99000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- 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