On Mon, Jun 3, 2019 at 1:41 PM syzbot <syzbot+93f2f45b19519b289613@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 69bbe8c7 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=1684d87ca00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229 > dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613 > 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+93f2f45b19519b289613@xxxxxxxxxxxxxxxxxxxxxxxxx > > worker_thread+0x96/0xe20 kernel/workqueue.c:2414 > kthread+0x30b/0x410 kernel/kthread.c:254 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > hso 3-1:0.2: Failed to find BULK IN ep > ================================================================== > BUG: KASAN: use-after-free in __lock_acquire+0x3a5d/0x5340 > kernel/locking/lockdep.c:3664 > Read of size 8 at addr ffff8881d98a4d60 by task kworker/0:0/5 > > CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1+ #10 > 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+0x67/0x231 mm/kasan/report.c:188 > __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317 > kasan_report+0xe/0x20 mm/kasan/common.c:614 > __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664 > lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4302 > __mutex_lock_common kernel/locking/mutex.c:925 [inline] > __mutex_lock+0xf9/0x12b0 kernel/locking/mutex.c:1072 > device_lock include/linux/device.h:1207 [inline] > device_del+0xa2/0xb80 drivers/base/core.c:2240 > device_unregister drivers/base/core.c:2306 [inline] > device_destroy+0x90/0xd0 drivers/base/core.c:2864 > tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189 > hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline] > hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline] > hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948 > usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 > really_probe+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_set_configuration+0xdf6/0x1670 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+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432 > process_one_work+0x905/0x1570 kernel/workqueue.c:2268 > worker_thread+0x96/0xe20 kernel/workqueue.c:2414 > kthread+0x30b/0x410 kernel/kthread.c:254 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Allocated by task 3910: > save_stack+0x1b/0x80 mm/kasan/common.c:71 > set_track mm/kasan/common.c:79 [inline] > __kasan_kmalloc mm/kasan/common.c:489 [inline] > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462 > kmalloc include/linux/slab.h:547 [inline] > kzalloc include/linux/slab.h:742 [inline] > tty_register_device_attr+0x1b6/0x6f0 drivers/tty/tty_io.c:3128 > hso_serial_common_create+0x113/0x710 drivers/net/usb/hso.c:2279 > hso_create_bulk_serial_device drivers/net/usb/hso.c:2652 [inline] > hso_probe+0xc93/0x1a46 drivers/net/usb/hso.c:2948 > usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 > really_probe+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_set_configuration+0xdf6/0x1670 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+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432 > process_one_work+0x905/0x1570 kernel/workqueue.c:2268 > process_scheduled_works kernel/workqueue.c:2330 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416 > kthread+0x30b/0x410 kernel/kthread.c:254 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Freed by task 3910: > save_stack+0x1b/0x80 mm/kasan/common.c:71 > set_track mm/kasan/common.c:79 [inline] > __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451 > slab_free_hook mm/slub.c:1421 [inline] > slab_free_freelist_hook mm/slub.c:1448 [inline] > slab_free mm/slub.c:2994 [inline] > kfree+0xd7/0x280 mm/slub.c:3949 > device_release+0x71/0x200 drivers/base/core.c:1064 > kobject_cleanup lib/kobject.c:691 [inline] > kobject_release lib/kobject.c:720 [inline] > kref_put include/linux/kref.h:67 [inline] > kobject_put+0x171/0x280 lib/kobject.c:737 > put_device drivers/base/core.c:2210 [inline] > device_unregister drivers/base/core.c:2307 [inline] > device_destroy+0x98/0xd0 drivers/base/core.c:2864 > tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189 > hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline] > hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline] > hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948 > usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 > really_probe+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_set_configuration+0xdf6/0x1670 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+0x281/0x660 drivers/base/dd.c:509 > driver_probe_device+0x104/0x210 drivers/base/dd.c:670 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 > bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:843 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2111 > usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432 > process_one_work+0x905/0x1570 kernel/workqueue.c:2268 > process_scheduled_works kernel/workqueue.c:2330 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416 > kthread+0x30b/0x410 kernel/kthread.c:254 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > The buggy address belongs to the object at ffff8881d98a4c80 > which belongs to the cache kmalloc-2k of size 2048 > The buggy address is located 224 bytes inside of > 2048-byte region [ffff8881d98a4c80, ffff8881d98a5480) > The buggy address belongs to the page: > page:ffffea0007662800 refcount:1 mapcount:0 mapping:ffff8881dac02800 > index:0x0 compound_mapcount: 0 > flags: 0x200000000010200(slab|head) > raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02800 > raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881d98a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8881d98a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff8881d98a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8881d98a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d98a4e00: 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. #syz dup: general protection fault in cdev_del
