================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:673 [inline] BUG: KASAN: use-after-free in enqueue_timer kernel/time/timer.c:520 [inline] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:531 Write of size 8 at addr ffff88002c563ac8 by task kworker/u8:0/5 CPU: 1 PID: 5 Comm: kworker/u8:0 Not tainted 4.13.0-next-20170915+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: netns cleanup_net Call Trace: __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 hlist_add_head include/linux/list.h:673 [inline] enqueue_timer kernel/time/timer.c:520 [inline] __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:531 internal_add_timer kernel/time/timer.c:573 [inline] __mod_timer kernel/time/timer.c:1024 [inline] mod_timer+0x622/0x15b0 kernel/time/timer.c:1071 rpm_suspend+0x126b/0x1610 drivers/base/power/runtime.c:533 pm_suspend_timer_fn+0x166/0x1d0 drivers/base/power/runtime.c:909 call_timer_fn+0x246/0x850 kernel/time/timer.c:1281 expire_timers kernel/time/timer.c:1320 [inline] __run_timers+0x7fd/0xb90 kernel/time/timer.c:1620 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 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_acquire+0x256/0x580 kernel/locking/lockdep.c:4005 RSP: 0018:ffff88003ebdef98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff88003ebd6140 RCX: 0000000000000000 RDX: 1ffffffff0b5933d RSI: 00000000d3fe9aea RDI: 0000000000000282 RBP: ffff88003ebdf090 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff87061ce0 R12: 1ffff10007d7bdf9 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:244 [inline] rcu_read_lock include/linux/rcupdate.h:630 [inline] inet_twsk_purge+0x39f/0x770 net/ipv4/inet_timewait_sock.c:271 dccp_v4_exit_batch+0x1a/0x20 net/dccp/ipv4.c:1024 ops_exit_list.isra.6+0x100/0x150 net/core/net_namespace.c:145 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 process_one_work+0xbfa/0x1bd0 kernel/workqueue.c:2119 worker_thread+0x223/0x1860 kernel/workqueue.c:2253 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Allocated by task 10507: 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 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:535 [inline] kvmalloc_node+0x64/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:529 [inline] kvzalloc include/linux/mm.h:537 [inline] alloc_netdev_mqs+0x16e/0xed0 net/core/dev.c:8018 tun_set_iff drivers/net/tun.c:2022 [inline] __tun_chr_ioctl+0x12be/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 Freed by task 10507: 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 ffff88002c5606c0 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 13320 bytes inside of 16384-byte region [ffff88002c5606c0, ffff88002c5646c0) The buggy address belongs to the page: page:ffffea0000b15800 count:1 mapcount:0 mapping:ffff88002c5606c0 index:0x0 compound_mapcount: 0 flags: 0x100000000008100(slab|head) raw: 0100000000008100 ffff88002c5606c0 0000000000000000 0000000100000001 raw: ffffea0000a73c20 ffffea0000b02c20 ffff88003e802200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88002c563980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88002c563a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88002c563a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88002c563b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88002c563b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================