ACPI: bus type USB registered usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb ================================================================== BUG: KASAN: use-after-free in call_usermodehelper_exec_work+0x2d3/0x310 kernel/umh.c:195 Write of size 4 at addr ffff8801d6b6c670 by task kworker/u4:0/6 CPU: 0 PID: 6 Comm: kworker/u4:0 Not tainted 4.17.0-rc6+ #36 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437 call_usermodehelper_exec_work+0x2d3/0x310 kernel/umh.c:195 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Allocated by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] call_usermodehelper_setup+0xe8/0x400 kernel/umh.c:382 kobject_uevent_env+0xb21/0x1110 lib/kobject_uevent.c:608 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:636 kset_register+0x4d/0x70 lib/kobject.c:817 __class_register+0x282/0x520 drivers/base/class.c:181 __class_create+0xd1/0x140 drivers/base/class.c:235 pps_init+0x1f/0x106 drivers/pps/pps.c:465 do_one_initcall+0x127/0x913 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1135 kernel_init+0x11/0x1b3 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Freed by task 1252: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 call_usermodehelper_freeinfo kernel/umh.c:45 [inline] umh_complete+0x7b/0x90 kernel/umh.c:59 call_usermodehelper_exec_async+0x6e8/0x9e0 kernel/umh.c:116 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d6b6c600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 112 bytes inside of 192-byte region [ffff8801d6b6c600, ffff8801d6b6c6c0) The buggy address belongs to the page: page:ffffea00075adb00 count:1 mapcount:0 mapping:ffff8801d6b6c000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d6b6c000 0000000000000000 0000000100000010 raw: ffffea0007597be0 ffff8801da801148 ffff8801da800040 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d6b6c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d6b6c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801d6b6c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d6b6c680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d6b6c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================