On Tue, Oct 1, 2019 at 12:39 AM syzbot <syzbot+3930f3e416920885c9d4@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > 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=104c47bd600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=69ddefac6929256a > dashboard link: https://syzkaller.appspot.com/bug?extid=3930f3e416920885c9d4 > 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+3930f3e416920885c9d4@xxxxxxxxxxxxxxxxxxxxxxxxx > > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > hso 2-1:0.9: Failed to find BULK IN ep > ================================================================== > BUG: KASAN: use-after-free in __mutex_lock_common > kernel/locking/mutex.c:938 [inline] > BUG: KASAN: use-after-free in __mutex_lock+0xf23/0x1360 > kernel/locking/mutex.c:1103 > Read of size 8 at addr ffff8881c73389d8 by task kworker/0:4/2784 > > CPU: 0 PID: 2784 Comm: kworker/0:4 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 > __mutex_lock_common kernel/locking/mutex.c:938 [inline] > __mutex_lock+0xf23/0x1360 kernel/locking/mutex.c:1103 > device_lock include/linux/device.h:1462 [inline] > device_del+0x9e/0xb10 drivers/base/core.c:2341 > device_unregister drivers/base/core.c:2407 [inline] > device_destroy+0x96/0xe0 drivers/base/core.c:2986 > tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3185 > hso_serial_tty_unregister drivers/net/usb/hso.c:2231 [inline] > hso_create_bulk_serial_device drivers/net/usb/hso.c:2668 [inline] > hso_probe.cold+0xc8/0x121 drivers/net/usb/hso.c:2934 > 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+0xae6/0x16f0 drivers/base/core.c:2201 > 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+0x281/0x6d0 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+0xae6/0x16f0 drivers/base/core.c:2201 > usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 > hub_port_connect drivers/usb/core/hub.c:5098 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] > port_event drivers/usb/core/hub.c:5359 [inline] > hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > worker_thread+0x96/0xe20 kernel/workqueue.c:2415 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Allocated by task 2830: > save_stack+0x1b/0x80 mm/kasan/common.c:69 > set_track mm/kasan/common.c:77 [inline] > __kasan_kmalloc mm/kasan/common.c:510 [inline] > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483 > kmalloc include/linux/slab.h:552 [inline] > kzalloc include/linux/slab.h:686 [inline] > tty_register_device_attr+0x1b6/0x6f0 drivers/tty/tty_io.c:3124 > hso_serial_common_create+0x113/0x710 drivers/net/usb/hso.c:2265 > hso_create_bulk_serial_device drivers/net/usb/hso.c:2638 [inline] > hso_probe+0xc93/0x1a46 drivers/net/usb/hso.c:2934 > 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+0xae6/0x16f0 drivers/base/core.c:2201 > 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+0x281/0x6d0 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+0xae6/0x16f0 drivers/base/core.c:2201 > usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 > hub_port_connect drivers/usb/core/hub.c:5098 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] > port_event drivers/usb/core/hub.c:5359 [inline] > hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > worker_thread+0x96/0xe20 kernel/workqueue.c:2415 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Freed by task 2830: > save_stack+0x1b/0x80 mm/kasan/common.c:69 > set_track mm/kasan/common.c:77 [inline] > kasan_set_free_info mm/kasan/common.c:332 [inline] > __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471 > slab_free_hook mm/slub.c:1424 [inline] > slab_free_freelist_hook mm/slub.c:1475 [inline] > slab_free mm/slub.c:3018 [inline] > kfree+0xe4/0x2f0 mm/slub.c:3959 > device_release+0x71/0x200 drivers/base/core.c:1100 > kobject_cleanup lib/kobject.c:693 [inline] > kobject_release lib/kobject.c:722 [inline] > kref_put include/linux/kref.h:65 [inline] > kobject_put+0x171/0x280 lib/kobject.c:739 > put_device drivers/base/core.c:2300 [inline] > device_unregister drivers/base/core.c:2408 [inline] > device_destroy+0x9e/0xe0 drivers/base/core.c:2986 > tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3185 > hso_serial_tty_unregister drivers/net/usb/hso.c:2231 [inline] > hso_create_bulk_serial_device drivers/net/usb/hso.c:2668 [inline] > hso_probe.cold+0xc8/0x121 drivers/net/usb/hso.c:2934 > 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+0xae6/0x16f0 drivers/base/core.c:2201 > 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+0x281/0x6d0 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+0xae6/0x16f0 drivers/base/core.c:2201 > usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 > hub_port_connect drivers/usb/core/hub.c:5098 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] > port_event drivers/usb/core/hub.c:5359 [inline] > hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > worker_thread+0x96/0xe20 kernel/workqueue.c:2415 > 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 ffff8881c7338880 > which belongs to the cache kmalloc-2k of size 2048 > The buggy address is located 344 bytes inside of > 2048-byte region [ffff8881c7338880, ffff8881c7339080) > The buggy address belongs to the page: > page:ffffea00071cce00 refcount:1 mapcount:0 mapping:ffff8881da00c000 > index:0x0 compound_mapcount: 0 > flags: 0x200000000010200(slab|head) > raw: 0200000000010200 0000000000000000 0000000100000001 ffff8881da00c000 > raw: 0000000000000000 00000000000f000f 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881c7338880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881c7338900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff8881c7338980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8881c7338a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881c7338a80: 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. Most likely the same issue as: #syz dup: WARNING in hso_probe https://syzkaller.appspot.com/bug?id=d3a08ccf68916f3b12821b5267b3e763244685af
