syzbot

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BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: use-after-free in usb_kill_urb+0x1c6/0x2e0 drivers/usb/core/urb.c:696
Read of size 4 at addr ffff8881d37af810 by task systemd-udevd/3114

CPU: 0 PID: 3114 Comm: systemd-udevd Not tainted 5.4.31-syzkaller-00073-gfa41ab5369c7 #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+0x14a/0x1ce lib/dump_stack.c:118
 print_address_description+0x93/0x620 mm/kasan/report.c:374
 __kasan_report+0x16d/0x1e0 mm/kasan/report.c:506
 kasan_report+0x34/0x60 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:182 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 usb_kill_urb+0x1c6/0x2e0 drivers/usb/core/urb.c:696
 usbhid_close+0x139/0x1d0 drivers/hid/usbhid/hid-core.c:750
 hid_hw_close+0xa1/0xd0 drivers/hid/hid-core.c:2100
 input_close_device+0x275/0x310 drivers/input/input.c:683
 evdev_close_device drivers/input/evdev.c:428 [inline]
 evdev_release+0x6aa/0x6f0 drivers/input/evdev.c:466
 __fput+0x27d/0x6c0 fs/file_table.c:280
 task_work_run+0x176/0x1a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x286/0x2e0 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fe545389270
Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24
RSP: 002b:00007fff3b384228 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe545389270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007fe546242710 R08: 0000555ca3d9a2a9 R09: 0000000000000078
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 0000000000000000 R14: 00007fff3b3842d4 R15: 0000000000000000

Allocated by task 115:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x12c/0x1c0 mm/kasan/common.c:510
 __kmalloc+0xf7/0x2c0 mm/slub.c:3821
 kmalloc include/linux/slab.h:561 [inline]
 usb_alloc_urb+0x3d/0x140 drivers/usb/core/urb.c:74
 usbhid_start+0x102a/0x23f0 drivers/hid/usbhid/hid-core.c:1121
 hid_hw_start+0x5c/0x100 drivers/hid/hid-core.c:2030
 wacom_parse_and_register+0x5444/0x6e00 drivers/hid/wacom_sys.c:2365
 wacom_probe+0x5f8/0x780 drivers/hid/wacom_sys.c:2748
 hid_device_probe+0x274/0x410 drivers/hid/hid-core.c:2263
 really_probe+0x6fe/0xf50 drivers/base/dd.c:551
 driver_probe_device+0xe6/0x230 drivers/base/dd.c:724
 bus_for_each_drv+0x17a/0x200 drivers/base/bus.c:430
 __device_attach+0x275/0x410 drivers/base/dd.c:897
 bus_probe_device+0xb8/0x1e0 drivers/base/bus.c:490
 device_add+0x1054/0x1740 drivers/base/core.c:2507
 hid_add_device+0xd7e/0xfd0 drivers/hid/hid-core.c:2419
 usbhid_probe+0x94e/0xcc0 drivers/hid/usbhid/hid-core.c:1386
 usb_probe_interface+0x621/0xac0 drivers/usb/core/driver.c:361
 really_probe+0x75b/0xf50 drivers/base/dd.c:555
 driver_probe_device+0xe6/0x230 drivers/base/dd.c:724
 bus_for_each_drv+0x17a/0x200 drivers/base/bus.c:430
 __device_attach+0x275/0x410 drivers/base/dd.c:897
 bus_probe_device+0xb8/0x1e0 drivers/base/bus.c:490
 device_add+0x1054/0x1740 drivers/base/core.c:2507
 usb_set_configuration+0x184c/0x1dc0 drivers/usb/core/message.c:2023
 generic_probe+0x82/0x140 drivers/usb/core/generic.c:210
 really_probe+0x75b/0xf50 drivers/base/dd.c:555
 driver_probe_device+0xe6/0x230 drivers/base/dd.c:724
 bus_for_each_drv+0x17a/0x200 drivers/base/bus.c:430
 __device_attach+0x275/0x410 drivers/base/dd.c:897
 bus_probe_device+0xb8/0x1e0 drivers/base/bus.c:490
 device_add+0x1054/0x1740 drivers/base/core.c:2507
 usb_new_device+0x9ba/0xfc0 drivers/usb/core/hub.c:2548
 hub_port_connect drivers/usb/core/hub.c:5110 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5225 [inline]
 port_event drivers/usb/core/hub.c:5371 [inline]
 hub_event+0x28eb/0x4fc0 drivers/usb/core/hub.c:5453
 process_one_work+0x777/0xf90 kernel/workqueue.c:2274
 process_scheduled_works kernel/workqueue.c:2336 [inline]
 worker_thread+0xdb6/0x1430 kernel/workqueue.c:2422
 kthread+0x2df/0x300 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Freed by task 246:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x181/0x230 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1424 [inline]
 slab_free_freelist_hook+0xd0/0x140 mm/slub.c:1457
 slab_free mm/slub.c:3014 [inline]
 kfree+0x12b/0x5f0 mm/slub.c:3975
 usbhid_stop+0x22c/0x570 drivers/hid/usbhid/hid-core.c:1217
 wacom_remove+0x84/0x2e0 drivers/hid/wacom_sys.c:2772
 hid_device_remove+0xd2/0x390 drivers/hid/hid-core.c:2296
 __device_release_driver drivers/base/dd.c:1137 [inline]
 device_release_driver_internal+0x505/0x790 drivers/base/dd.c:1168
 bus_remove_device+0x2e0/0x350 drivers/base/bus.c:532
 device_del+0x7a7/0x11f0 drivers/base/core.c:2684
 hid_remove_device drivers/hid/hid-core.c:2467 [inline]
 hid_destroy_device+0x66/0x100 drivers/hid/hid-core.c:2486
 usbhid_disconnect+0x9a/0xc0 drivers/hid/usbhid/hid-core.c:1413
 usb_unbind_interface+0x1cf/0x840 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1137 [inline]
 device_release_driver_internal+0x505/0x790 drivers/base/dd.c:1168
 bus_remove_device+0x2e0/0x350 drivers/base/bus.c:532
 device_del+0x7a7/0x11f0 drivers/base/core.c:2684
 usb_disable_device+0x3f3/0xb80 drivers/usb/core/message.c:1237
 usb_disconnect+0x341/0x880 drivers/usb/core/hub.c:2211
 hub_port_connect drivers/usb/core/hub.c:4961 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5225 [inline]
 port_event drivers/usb/core/hub.c:5371 [inline]
 hub_event+0x1c44/0x4fc0 drivers/usb/core/hub.c:5453
 process_one_work+0x777/0xf90 kernel/workqueue.c:2274
 worker_thread+0xa8f/0x1430 kernel/workqueue.c:2420
 kthread+0x2df/0x300 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881d37af800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 16 bytes inside of
 256-byte region [ffff8881d37af800, ffff8881d37af900)
The buggy address belongs to the page:
page:ffffea00074deb80 refcount:1 mapcount:0 mapping:ffff8881da802e00 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881da802e00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d37af700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881d37af780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881d37af800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff8881d37af880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d37af900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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