IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3c66/0x5270 kernel/locking/lockdep.c:3092 Read of size 8 at addr ffff8801cafd1a20 by task syz-executor6/11674 CPU: 0 PID: 11674 Comm: syz-executor6 Not tainted 4.4.151-ge917467 #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 0613aeca960dd1b0 ffff8801ca3efa30 ffffffff81e15eed ffffea00072bf400 ffff8801cafd1a20 0000000000000000 ffff8801cafd1a20 0000000000000000 ffff8801ca3efa68 ffffffff8151b390 ffff8801cafd1a20 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:587 [] sock_close+0x16/0x20 net/socket.c:1038 [] __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:253 [] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:349 [inline] [] do_syscall_32_irqs_on arch/x86/entry/common.c:399 [inline] [] do_fast_syscall_32+0x61e/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x1a Allocated by task 11688: [] 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:1178 [] sock_create net/socket.c:1218 [inline] [] SYSC_socket net/socket.c:1248 [inline] [] SyS_socket+0xf0/0x1b0 net/socket.c:1228 [] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline] [] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x1a Freed by task 11674: [] 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:587 [] sock_close+0x16/0x20 net/socket.c:1038 [] __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:253 [] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:349 [inline] [] do_syscall_32_irqs_on arch/x86/entry/common.c:399 [inline] [] do_fast_syscall_32+0x61e/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x1a The buggy address belongs to the object at ffff8801cafd1980 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 160 bytes inside of 2048-byte region [ffff8801cafd1980, ffff8801cafd2180) The buggy address belongs to the page: syz-executor2: Corrupted page table at address f77d9be9 PGD 1c9ff8067 PUD ffffffff81490337 BAD Bad pagetable: 001d [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 3831 Comm: syz-executor2 Not tainted 4.4.151-ge917467 #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d8da4800 task.stack: ffff8801d9360000 RIP: 0023:[<00000000f77d9be9>] [<00000000f77d9be9>] 0xf77d9be9 RSP: 002b:000000000845fd7c EFLAGS: 00010246 RAX: 0000000000000000 RBX: 000000000845fda8 RCX: 00000000f77d9be9 RDX: 0000000000000004 RSI: 0000000000012253 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009096900 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffffc7ff81490dd8 CR3: 00000001d1af8000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 RIP [<00000000f77d9be9>] 0xf77d9be9 RSP <000000000845fd7c> ---[ end trace 25d2bde005389a07 ]---