================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:938 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x1033/0x13c0 kernel/locking/mutex.c:1103 Read of size 8 at addr ffff8880a8835158 by task syz-executor.4/10093 CPU: 1 PID: 10093 Comm: syz-executor.4 Not tainted 5.7.0-rc6-next-20200522-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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __mutex_lock_common kernel/locking/mutex.c:938 [inline] __mutex_lock+0x1033/0x13c0 kernel/locking/mutex.c:1103 evdev_mark_dead drivers/input/evdev.c:1314 [inline] evdev_cleanup+0x21/0x190 drivers/input/evdev.c:1323 evdev_disconnect+0x45/0xb0 drivers/input/evdev.c:1408 __input_unregister_device+0x1b0/0x430 drivers/input/input.c:2091 input_unregister_device+0xb4/0xf0 drivers/input/input.c:2273 uinput_destroy_device+0x1e2/0x240 drivers/input/misc/uinput.c:298 uinput_release+0x37/0x50 drivers/input/misc/uinput.c:710 __fput+0x33e/0x880 fs/file_table.c:281 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2fa/0x360 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+0x6b1/0x7d0 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:00007ffe5fe80d40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416621 RDX: 0000001b31b20000 RSI: 00000000000000d0 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00000000551800d0 R09: 00000000551800d4 R10: 00007ffe5fe80e30 R11: 0000000000000293 R12: 000000000078c900 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078bfac Allocated by task 10100: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] evdev_connect+0x80/0x4d0 drivers/input/evdev.c:1352 input_attach_handler+0x194/0x200 drivers/input/input.c:1031 input_register_device.cold+0xf5/0x246 drivers/input/input.c:2229 uinput_create_device drivers/input/misc/uinput.c:364 [inline] uinput_ioctl_handler.isra.0+0x1210/0x1d80 drivers/input/misc/uinput.c:870 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 10093: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 device_release+0x71/0x200 drivers/base/core.c:1541 kobject_cleanup lib/kobject.c:701 [inline] kobject_release lib/kobject.c:732 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x2f0 lib/kobject.c:749 cdev_device_del+0x69/0x80 fs/char_dev.c:575 evdev_disconnect+0x3d/0xb0 drivers/input/evdev.c:1407 __input_unregister_device+0x1b0/0x430 drivers/input/input.c:2091 input_unregister_device+0xb4/0xf0 drivers/input/input.c:2273 uinput_destroy_device+0x1e2/0x240 drivers/input/misc/uinput.c:298 uinput_release+0x37/0x50 drivers/input/misc/uinput.c:710 __fput+0x33e/0x880 fs/file_table.c:281 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2fa/0x360 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+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff8880a8835000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 344 bytes inside of 2048-byte region [ffff8880a8835000, ffff8880a8835800) The buggy address belongs to the page: page:ffffea0002a20d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029dca08 ffffea0002a040c8 ffff8880aa000e00 raw: 0000000000000000 ffff8880a8835000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8835000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8835080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a8835100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8835180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8835200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================