Warning: Permanently added '10.128.0.206' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.701329][ T6808] input: syz0 as /devices/virtual/input/input5 [ 59.714556][ T6808] ================================================================== [ 59.722786][ T6808] BUG: KASAN: use-after-free in __mutex_lock+0x1033/0x13c0 [ 59.729991][ T6808] Read of size 8 at addr ffff88809f1b2158 by task syz-executor043/6808 [ 59.738224][ T6808] [ 59.740560][ T6808] CPU: 1 PID: 6808 Comm: syz-executor043 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 59.750444][ T6808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.760529][ T6808] Call Trace: [ 59.763909][ T6808] dump_stack+0x18f/0x20d [ 59.768243][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 59.773159][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 59.778007][ T6808] print_address_description.constprop.0.cold+0xd3/0x413 [ 59.785065][ T6808] ? cdev_device_del+0x69/0x80 [ 59.789825][ T6808] ? evdev_disconnect+0x3d/0xb0 [ 59.794662][ T6808] ? __input_unregister_device+0x1b0/0x430 [ 59.800448][ T6808] ? input_unregister_device+0xb4/0xf0 [ 59.805895][ T6808] ? uinput_destroy_device+0x1e2/0x240 [ 59.811344][ T6808] ? vprintk_func+0x97/0x1a6 [ 59.815914][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 59.820758][ T6808] kasan_report.cold+0x1f/0x37 [ 59.825518][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 59.830351][ T6808] __mutex_lock+0x1033/0x13c0 [ 59.835028][ T6808] ? evdev_cleanup+0x21/0x190 [ 59.839752][ T6808] ? print_usage_bug+0x240/0x240 [ 59.844695][ T6808] ? trace_hardirqs_off+0x50/0x220 [ 59.850244][ T6808] ? mutex_trylock+0x2c0/0x2c0 [ 59.855012][ T6808] ? mark_held_locks+0x9f/0xe0 [ 59.859756][ T6808] ? kfree+0x1eb/0x2b0 [ 59.863827][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.869810][ T6808] ? kfree_const+0x51/0x60 [ 59.874227][ T6808] ? evdev_cleanup+0x21/0x190 [ 59.878884][ T6808] evdev_cleanup+0x21/0x190 [ 59.883515][ T6808] evdev_disconnect+0x45/0xb0 [ 59.888204][ T6808] __input_unregister_device+0x1b0/0x430 [ 59.893816][ T6808] input_unregister_device+0xb4/0xf0 [ 59.899083][ T6808] uinput_destroy_device+0x1e2/0x240 [ 59.904868][ T6808] ? uinput_destroy_device+0x240/0x240 [ 59.910317][ T6808] uinput_release+0x37/0x50 [ 59.914836][ T6808] __fput+0x33e/0x880 [ 59.918803][ T6808] task_work_run+0xf4/0x1b0 [ 59.923355][ T6808] do_exit+0xb5e/0x2e10 [ 59.927487][ T6808] ? fsnotify_first_mark+0x191/0x200 [ 59.932752][ T6808] ? debug_smp_processor_id+0x2f/0x185 [ 59.938191][ T6808] ? mm_update_next_owner+0x7a0/0x7a0 [ 59.943571][ T6808] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.949556][ T6808] ? vfs_write+0x161/0x5d0 [ 59.953956][ T6808] do_group_exit+0x125/0x340 [ 59.958546][ T6808] __x64_sys_exit_group+0x3a/0x50 [ 59.963702][ T6808] do_syscall_64+0xf6/0x7d0 [ 59.968196][ T6808] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.974103][ T6808] RIP: 0033:0x43f9f8 [ 59.977991][ T6808] Code: Bad RIP value. [ 59.982033][ T6808] RSP: 002b:00007ffc9f9b8078 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 59.990449][ T6808] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f9f8 [ 59.998534][ T6808] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 60.006532][ T6808] RBP: 00000000004bf248 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 60.014567][ T6808] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 60.022523][ T6808] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 60.030482][ T6808] [ 60.032803][ T6808] Allocated by task 6808: [ 60.037114][ T6808] save_stack+0x1b/0x40 [ 60.041246][ T6808] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 60.046872][ T6808] kmem_cache_alloc_trace+0x153/0x7d0 [ 60.052412][ T6808] evdev_connect+0x80/0x4d0 [ 60.056995][ T6808] input_attach_handler+0x194/0x200 [ 60.062238][ T6808] input_register_device.cold+0xf5/0x246 [ 60.067880][ T6808] uinput_ioctl_handler.isra.0+0x1210/0x1d80 [ 60.073857][ T6808] ksys_ioctl+0x11a/0x180 [ 60.078180][ T6808] __x64_sys_ioctl+0x6f/0xb0 [ 60.082747][ T6808] do_syscall_64+0xf6/0x7d0 [ 60.087242][ T6808] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.093102][ T6808] [ 60.095405][ T6808] Freed by task 6808: [ 60.099380][ T6808] save_stack+0x1b/0x40 [ 60.103511][ T6808] __kasan_slab_free+0xf7/0x140 [ 60.108354][ T6808] kfree+0x109/0x2b0 [ 60.112225][ T6808] device_release+0x71/0x200 [ 60.116794][ T6808] kobject_put+0x1c8/0x2f0 [ 60.121187][ T6808] cdev_device_del+0x69/0x80 [ 60.125762][ T6808] evdev_disconnect+0x3d/0xb0 [ 60.130487][ T6808] __input_unregister_device+0x1b0/0x430 [ 60.136124][ T6808] input_unregister_device+0xb4/0xf0 [ 60.141399][ T6808] uinput_destroy_device+0x1e2/0x240 [ 60.146685][ T6808] uinput_release+0x37/0x50 [ 60.151173][ T6808] __fput+0x33e/0x880 [ 60.155129][ T6808] task_work_run+0xf4/0x1b0 [ 60.159624][ T6808] do_exit+0xb5e/0x2e10 [ 60.163755][ T6808] do_group_exit+0x125/0x340 [ 60.168336][ T6808] __x64_sys_exit_group+0x3a/0x50 [ 60.173337][ T6808] do_syscall_64+0xf6/0x7d0 [ 60.178093][ T6808] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.183954][ T6808] [ 60.186280][ T6808] The buggy address belongs to the object at ffff88809f1b2000 [ 60.186280][ T6808] which belongs to the cache kmalloc-2k of size 2048 [ 60.200308][ T6808] The buggy address is located 344 bytes inside of [ 60.200308][ T6808] 2048-byte region [ffff88809f1b2000, ffff88809f1b2800) [ 60.213654][ T6808] The buggy address belongs to the page: [ 60.219268][ T6808] page:ffffea00027c6c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 60.228533][ T6808] flags: 0xfffe0000000200(slab) [ 60.233363][ T6808] raw: 00fffe0000000200 ffffea00029dbec8 ffffea00027c6e88 ffff8880aa000e00 [ 60.241924][ T6808] raw: 0000000000000000 ffff88809f1b2000 0000000100000001 0000000000000000 [ 60.250484][ T6808] page dumped because: kasan: bad access detected [ 60.256879][ T6808] [ 60.259182][ T6808] Memory state around the buggy address: [ 60.264803][ T6808] ffff88809f1b2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.272857][ T6808] ffff88809f1b2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.280919][ T6808] >ffff88809f1b2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.288957][ T6808] ^ [ 60.295901][ T6808] ffff88809f1b2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.303937][ T6808] ffff88809f1b2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 60.311971][ T6808] ================================================================== [ 60.320005][ T6808] Disabling lock debugging due to kernel taint [ 60.326855][ T6808] Kernel panic - not syncing: panic_on_warn set ... [ 60.333453][ T6808] CPU: 1 PID: 6808 Comm: syz-executor043 Tainted: G B 5.7.0-rc6-next-20200522-syzkaller #0 [ 60.344724][ T6808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.354775][ T6808] Call Trace: [ 60.358070][ T6808] dump_stack+0x18f/0x20d [ 60.362409][ T6808] ? __mutex_lock+0xf50/0x13c0 [ 60.367152][ T6808] panic+0x2e3/0x75c [ 60.371038][ T6808] ? __warn_printk+0xf3/0xf3 [ 60.375617][ T6808] ? preempt_schedule_common+0x5e/0xc0 [ 60.381081][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 60.385919][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 60.390767][ T6808] ? preempt_schedule_thunk+0x16/0x18 [ 60.396112][ T6808] ? trace_hardirqs_on+0x55/0x230 [ 60.401110][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 60.405932][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 60.410768][ T6808] end_report+0x4d/0x53 [ 60.414899][ T6808] kasan_report.cold+0xd/0x37 [ 60.420089][ T6808] ? __mutex_lock+0x1033/0x13c0 [ 60.424914][ T6808] __mutex_lock+0x1033/0x13c0 [ 60.429567][ T6808] ? evdev_cleanup+0x21/0x190 [ 60.434328][ T6808] ? print_usage_bug+0x240/0x240 [ 60.439248][ T6808] ? trace_hardirqs_off+0x50/0x220 [ 60.444330][ T6808] ? mutex_trylock+0x2c0/0x2c0 [ 60.449070][ T6808] ? mark_held_locks+0x9f/0xe0 [ 60.453807][ T6808] ? kfree+0x1eb/0x2b0 [ 60.457873][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.463842][ T6808] ? kfree_const+0x51/0x60 [ 60.468234][ T6808] ? evdev_cleanup+0x21/0x190 [ 60.472913][ T6808] evdev_cleanup+0x21/0x190 [ 60.477390][ T6808] evdev_disconnect+0x45/0xb0 [ 60.482042][ T6808] __input_unregister_device+0x1b0/0x430 [ 60.487668][ T6808] input_unregister_device+0xb4/0xf0 [ 60.492926][ T6808] uinput_destroy_device+0x1e2/0x240 [ 60.498206][ T6808] ? uinput_destroy_device+0x240/0x240 [ 60.503654][ T6808] uinput_release+0x37/0x50 [ 60.508406][ T6808] __fput+0x33e/0x880 [ 60.512366][ T6808] task_work_run+0xf4/0x1b0 [ 60.516843][ T6808] do_exit+0xb5e/0x2e10 [ 60.520985][ T6808] ? fsnotify_first_mark+0x191/0x200 [ 60.526351][ T6808] ? debug_smp_processor_id+0x2f/0x185 [ 60.531785][ T6808] ? mm_update_next_owner+0x7a0/0x7a0 [ 60.537133][ T6808] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.543105][ T6808] ? vfs_write+0x161/0x5d0 [ 60.547520][ T6808] do_group_exit+0x125/0x340 [ 60.552185][ T6808] __x64_sys_exit_group+0x3a/0x50 [ 60.557203][ T6808] do_syscall_64+0xf6/0x7d0 [ 60.561681][ T6808] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.567562][ T6808] RIP: 0033:0x43f9f8 [ 60.571443][ T6808] Code: Bad RIP value. [ 60.575488][ T6808] RSP: 002b:00007ffc9f9b8078 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 60.583881][ T6808] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f9f8 [ 60.591827][ T6808] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 60.599785][ T6808] RBP: 00000000004bf248 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 60.607729][ T6808] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 60.615776][ T6808] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 60.625300][ T6808] Kernel Offset: disabled [ 60.629624][ T6808] Rebooting in 86400 seconds..