==================================================================
BUG: KASAN: slab-out-of-bounds in __collect_expired_timers include/linux/list.h:729 [inline]
BUG: KASAN: slab-out-of-bounds in collect_expired_timers kernel/time/timer.c:1569 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
Write of size 8 at addr ffff880051433888 by task syz-executor7/8443
CPU: 3 PID: 8443 Comm: syz-executor7 Not tainted 4.13.0-next-20170911+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x24e/0x340 mm/kasan/report.c:409
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435
__collect_expired_timers include/linux/list.h:729 [inline]
collect_expired_timers kernel/time/timer.c:1569 [inline]
__run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
__do_softirq+0x2bb/0xbd0 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:638 [inline]
smp_apic_timer_interrupt+0x177/0x710 arch/x86/kernel/apic/apic.c:1048
apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
</IRQ>
RIP: 0010:debug_lockdep_rcu_enabled+0x15/0x90 kernel/rcu/update.c:299
RSP: 0018:ffff88006ba7f918 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 1ffff1000d74ff29 RCX: ffffc900029f8000
RDX: ffffffff861ce17c RSI: ffffffff81b2d547 RDI: ffffffff861ce17c
RBP: ffff88006ba7fa10 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff8705eca0 R12: ffff88002cedb200
R13: ffff88006ba7f9e8 R14: 0000000000000000 R15: 0000000000000000
mntput+0x61/0x90 fs/namespace.c:1246
path_put fs/namei.c:500 [inline]
terminate_walk+0x29e/0x550 fs/namei.c:612
path_openat+0xa70/0x3520 fs/namei.c:3536
do_filp_open+0x25b/0x3b0 fs/namei.c:3562
do_sys_open+0x502/0x6d0 fs/open.c:1059
SYSC_open fs/open.c:1077 [inline]
SyS_open+0x2d/0x40 fs/open.c:1072
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x40c731
RSP: 002b:00007fe437330080 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000017 RCX: 000000000040c731
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000004a8a11
RBP: 0000000000000082 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000023
R13: 0000000000005790 R14: 00000000006e8850 R15: 000000000000001a
Allocated by task 7615:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627
kmalloc include/linux/slab.h:493 [inline]
kzalloc include/linux/slab.h:666 [inline]
tipc_nametbl_init+0x241/0x5e0 net/tipc/name_table.c:810
tipc_init_net+0x347/0x570 net/tipc/core.c:69
ops_init+0x10a/0x570 net/core/net_namespace.c:118
setup_net+0x319/0x720 net/core/net_namespace.c:294
copy_net_ns+0x27c/0x580 net/core/net_namespace.c:418
create_new_namespaces+0x425/0x880 kernel/nsproxy.c:107
copy_namespaces+0x340/0x400 kernel/nsproxy.c:165
copy_process.part.36+0x22fd/0x4af0 kernel/fork.c:1738
copy_process kernel/fork.c:1548 [inline]
_do_fork+0x1ef/0xfe0 kernel/fork.c:2027
SYSC_clone kernel/fork.c:2137 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2131
do_syscall_64+0x26c/0x8c0 arch/x86/entry/common.c:287
return_from_SYSCALL_64+0x0/0x7a
Freed by task 7456:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3503 [inline]
kfree+0xca/0x250 mm/slab.c:3820
kvfree+0x36/0x60 mm/util.c:416
netdev_freemem net/core/dev.c:7970 [inline]
free_netdev+0x2cf/0x360 net/core/dev.c:8132
tun_set_iff drivers/net/tun.c:2105 [inline]
__tun_chr_ioctl+0x2cf6/0x3d20 drivers/net/tun.c:2276
tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2521
vfs_ioctl fs/ioctl.c:45 [inline]
do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
SYSC_ioctl fs/ioctl.c:700 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
entry_SYSCALL_64_fastpath+0x1f/0xbe
The buggy address belongs to the object at ffff880051430480
which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 13320 bytes inside of
16384-byte region [ffff880051430480, ffff880051434480)
The buggy address belongs to the page:
page:ffffea0001450c00 count:1 mapcount:0 mapping:ffff880051430480 index:0x0 compound_mapcount: 0
flags: 0x500000000008100(slab|head)
raw: 0500000000008100 ffff880051430480 0000000000000000 0000000100000001
raw: ffffea0001449c20 ffffea0001385c20 ffff88003e802200 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff880051433780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff880051433800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880051433880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff880051433900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff880051433980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================