================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:938 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x105d/0x13e0 kernel/locking/mutex.c:1103 Read of size 8 at addr ffff888097e17158 by task syz-executor.1/8443 CPU: 1 PID: 8443 Comm: syz-executor.1 Not tainted 5.7.0-rc5-syzkaller #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+0x128/0x182 lib/dump_stack.c:118 print_address_description.constprop.8.cold.10+0x9/0x317 mm/kasan/report.c:382 __kasan_report.cold.11+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x32/0x50 mm/kasan/common.c:625 __mutex_lock_common kernel/locking/mutex.c:938 [inline] __mutex_lock+0x105d/0x13e0 kernel/locking/mutex.c:1103 evdev_mark_dead drivers/input/evdev.c:1324 [inline] evdev_cleanup+0x1c/0x170 drivers/input/evdev.c:1333 evdev_disconnect+0x40/0xb0 drivers/input/evdev.c:1418 __input_unregister_device+0x199/0x3f0 drivers/input/input.c:2091 input_unregister_device+0x7f/0xb0 drivers/input/input.c:2273 uinput_destroy_device+0x18a/0x1f0 drivers/input/misc/uinput.c:298 uinput_release+0x32/0x60 drivers/input/misc/uinput.c:710 __fput+0x2a4/0x7a0 fs/file_table.c:280 task_work_run+0xc2/0x160 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x23d/0x2d0 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x52a/0x620 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x416621 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffeb2f891c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416621 RDX: 0000001b2c520000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffeb2f892b0 R11: 0000000000000293 R12: 0000000000792ac0 R13: 000000000000e181 R14: ffffffffffffffff R15: 000000000078bf0c Allocated by task 8445: save_stack+0x19/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc.constprop.17+0xc1/0xd0 mm/kasan/common.c:495 kmem_cache_alloc_trace+0x156/0x780 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] evdev_connect+0x66/0x430 drivers/input/evdev.c:1362 input_attach_handler+0xfc/0x170 drivers/input/input.c:1031 input_register_device.cold.21+0xb4/0x1ea drivers/input/input.c:2229 uinput_create_device drivers/input/misc/uinput.c:364 [inline] uinput_ioctl_handler.isra.11+0x983/0x1990 drivers/input/misc/uinput.c:870 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0xb8/0x110 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6a/0xb0 fs/ioctl.c:778 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 8443: save_stack+0x19/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x107/0x2b0 mm/slab.c:3757 device_release+0x65/0x1c0 drivers/base/core.c:1394 kobject_cleanup lib/kobject.c:701 [inline] kobject_release lib/kobject.c:732 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x12e/0x230 lib/kobject.c:749 evdev_disconnect+0x38/0xb0 drivers/input/evdev.c:1417 __input_unregister_device+0x199/0x3f0 drivers/input/input.c:2091 input_unregister_device+0x7f/0xb0 drivers/input/input.c:2273 uinput_destroy_device+0x18a/0x1f0 drivers/input/misc/uinput.c:298 uinput_release+0x32/0x60 drivers/input/misc/uinput.c:710 __fput+0x2a4/0x7a0 fs/file_table.c:280 task_work_run+0xc2/0x160 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x23d/0x2d0 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x52a/0x620 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff888097e17000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 344 bytes inside of 2048-byte region [ffff888097e17000, ffff888097e17800) The buggy address belongs to the page: page:ffffea00025f85c0 refcount:1 mapcount:0 mapping:000000003db6c889 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000230c108 ffffea000291b608 ffff8880aa400e00 raw: 0000000000000000 ffff888097e17000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888097e17000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888097e17080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888097e17100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888097e17180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888097e17200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================