binder: 8387:8390 unknown command -1775864925 binder: 8387:8390 ioctl c0306201 20007000 returned -22 binder: 8387:8390 BC_REQUEST_DEATH_NOTIFICATION invalid ref 0 binder: 8387:8390 IncRefs 0 refcount change on invalid ref 3 ret -22 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092 Read of size 8 at addr ffff8801b4f200a0 by task syz-executor4/8392 CPU: 0 PID: 8392 Comm: syz-executor4 Not tainted 4.4.138-g226f96b #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 91bf3a248a85bd62 ffff8801c90ff660 ffffffff81e0ed0d ffffea0006d3c800 ffff8801b4f200a0 0000000000000000 ffff8801b4f200a0 0000000000000000 ffff8801c90ff698 ffffffff81515a16 ffff8801b4f200a0 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x6c/0x216 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092 [] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592 [] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:137 [inline] [] _raw_spin_lock_bh+0x3a/0x50 kernel/locking/spinlock.c:175 [] spin_lock_bh include/linux/spinlock.h:307 [inline] [] lock_sock_nested+0x43/0x120 net/core/sock.c:2451 [] lock_sock include/net/sock.h:1493 [inline] [] pppol2tp_release+0x50/0x310 net/l2tp/l2tp_ppp.c:493 [] sock_release+0x96/0x1c0 net/socket.c:586 [] sock_close+0x16/0x20 net/socket.c:1037 [] __fput+0x235/0x6f0 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x10f/0x190 kernel/task_work.c:115 [] exit_task_work include/linux/task_work.h:21 [inline] [] do_exit+0x9e5/0x26b0 kernel/exit.c:759 [] do_group_exit+0x111/0x330 kernel/exit.c:889 [] get_signal+0x4ec/0x14b0 kernel/signal.c:2321 [] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:248 [] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348 [] int_ret_from_sys_call+0x25/0xa3 Allocated by task 8392: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616 [] __kmalloc+0x124/0x310 mm/slub.c:3613 [] kmalloc include/linux/slab.h:481 [inline] [] sk_prot_alloc+0x204/0x300 net/core/sock.c:1354 [] sk_alloc+0x3a/0x3a0 net/core/sock.c:1419 [] pppol2tp_create+0x33/0x1f0 net/l2tp/l2tp_ppp.c:551 [] pppox_create+0xf6/0x200 drivers/net/ppp/pppox.c:121 [] __sock_create+0x2f0/0x5f0 net/socket.c:1177 [] sock_create net/socket.c:1217 [inline] [] SYSC_socket net/socket.c:1247 [inline] [] SyS_socket+0xf0/0x1b0 net/socket.c:1227 [] entry_SYSCALL_64_fastpath+0x22/0x9e Freed by task 8392: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kfree+0xf4/0x310 mm/slub.c:3749 [] sk_prot_free net/core/sock.c:1391 [inline] [] sk_destruct+0x407/0x4c0 net/core/sock.c:1472 [] __sk_free+0x4f/0x220 net/core/sock.c:1480 [] sk_free+0x30/0x40 net/core/sock.c:1491 [] sock_put include/net/sock.h:1639 [inline] [] pppol2tp_session_sock_put+0x5f/0x70 net/l2tp/l2tp_ppp.c:286 [] l2tp_tunnel_closeall+0x23c/0x350 net/l2tp/l2tp_core.c:1277 [] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300 [] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421 [] sk_common_release+0x6d/0x300 net/core/sock.c:2680 [] udp_lib_close+0x15/0x20 include/net/udp.h:190 [] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:435 [] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424 [] sock_release+0x96/0x1c0 net/socket.c:586 [] sock_close+0x16/0x20 net/socket.c:1037 [] __fput+0x235/0x6f0 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x10f/0x190 kernel/task_work.c:115 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252 [] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348 [] int_ret_from_sys_call+0x25/0xa3 The buggy address belongs to the object at ffff8801b4f20000 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 160 bytes inside of 2048-byte region [ffff8801b4f20000, ffff8801b4f20800) The buggy address belongs to the page: kasan: CONFIG_KASAN_INLINE enabled kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: -927281792 Comm: Not tainted 4.4.138-g226f96b #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c8bac800 task.stack: ffffffff8148cf77 RIP: 0010:[] [] lookup_object lib/debugobjects.c:120 [inline] RIP: 0010:[] [] debug_object_deactivate+0x191/0x340 lib/debugobjects.c:465 RSP: 0018:ffff8801db307cf0 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 000000000072bf50 RCX: 00000000000e57ed RDX: 0000000000000000 RSI: ffffffff844c6720 RDI: 000000000072bf68 RBP: ffff8801db307da8 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed0043fffa09 R11: 0000000000000001 R12: 1ffff1003b660fa0 R13: ffffffff85a323a8 R14: ffff8801b6137df8 R15: 000000000004563e FS: 0000000000fe4940(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe2e865be0 CR3: 00000000a2012000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000092 ffffffff844c6720 0000000041b58ab3 ffffffff842092d7 ffffffff81e70670 000000be80ebffdc ffff8801db307d30 ffffffff810cbeb3 ffff8801db307d40 ffffffff810cbed9 ffff8801db307da8 ffffffff812b00b1 Call Trace: [] debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline] [] debug_deactivate kernel/time/hrtimer.c:462 [inline] [] __run_hrtimer kernel/time/hrtimer.c:1230 [inline] [] __hrtimer_run_queues+0x222/0x1000 kernel/time/hrtimer.c:1325 [] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359 [] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901 [] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925 [] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741 Code: [ 820.431114] ------------[ cut here ]------------ WARNING: CPU: 1 PID: -927281792 at include/linux/uaccess.h:15 pagefault_disabled_dec include/linux/uaccess.h:15 [inline]() WARNING: CPU: 1 PID: -927281792 at include/linux/uaccess.h:15 pagefault_enable include/linux/uaccess.h:42 [inline]() WARNING: CPU: 1 PID: -927281792 at include/linux/uaccess.h:15 __probe_kernel_read+0x1b9/0x200 mm/maccess.c:35()