================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:704 [inline] BUG: KASAN: use-after-free in hlist_del_rcu include/linux/rculist.h:455 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x9ec/0xa00 net/xfrm/xfrm_policy.c:2212 Write of size 8 at addr ffff88806907e950 by task kworker/u4:9/11595 CPU: 0 PID: 11595 Comm: kworker/u4:9 Not tainted 5.0.0-rc3+ #21 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 __hlist_del include/linux/list.h:704 [inline] hlist_del_rcu include/linux/rculist.h:455 [inline] __xfrm_policy_unlink+0x9ec/0xa00 net/xfrm/xfrm_policy.c:2212 IPVS: ftp: loaded support on port[0] = 21 xfrm_policy_delete+0x4a/0x90 net/xfrm/xfrm_policy.c:2238 xfrm_policy_timer+0x468/0x660 net/xfrm/xfrm_policy.c:370 call_timer_fn+0x254/0x900 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x20 kernel/kcov.c:161 Code: ff 5d c3 0f 1f 80 00 00 00 00 55 0f b7 d6 0f b7 f7 bf 02 00 00 00 48 89 e5 48 8b 4d 08 e8 58 ff ff ff 5d c3 66 0f 1f 44 00 00 <55> 89 f2 89 fe bf 04 00 00 00 48 89 e5 48 8b 4d 08 e8 3a ff ff ff RSP: 0018:ffff88805e15f8b0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8880a4204dc0 RCX: 1ffff1100bc2bf02 RDX: dffffc0000000000 RSI: 0000000000000400 RDI: 000000000000028a RBP: ffff88805e15f9e0 R08: ffff8880690e43c0 R09: 0000000000000003 R10: 0000000000000000 R11: ffff8880ae62dc7b R12: 0000000000000400 R13: 0000000000000000 R14: 000000000000028a R15: dffffc0000000000 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 kobject: 'queues' (00000000dda30f69): kobject_uevent_env ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 15462: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kobject: 'queues' (00000000dda30f69): kobject_uevent_env: filter function caused the event to drop! kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] xfrm_policy_alloc+0xfb/0x530 net/xfrm/xfrm_policy.c:383 xfrm_policy_construct+0x30/0x660 net/xfrm/xfrm_user.c:1599 xfrm_add_policy+0x20a/0x6c0 net/xfrm/xfrm_user.c:1648 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 kobject: 'rx-0' (0000000055629295): kobject_add_internal: parent: 'queues', set: 'queues' xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 kobject: 'rx-0' (0000000055629295): kobject_uevent_env __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'rx-0' (0000000055629295): fill_kobj_path: path = '/devices/virtual/net/tunl0/queues/rx-0' Freed by task 9: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 kobject: 'tx-0' (00000000815887f4): kobject_add_internal: parent: 'queues', set: 'queues' xfrm_policy_destroy_rcu+0x48/0x60 net/xfrm/xfrm_policy.c:407 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0xc4a/0x1680 kernel/rcu/tree.c:2754 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 The buggy address belongs to the object at ffff88806907e940 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 16 bytes inside of 1024-byte region [ffff88806907e940, ffff88806907ed40) The buggy address belongs to the page: kobject: 'tx-0' (00000000815887f4): kobject_uevent_env page:ffffea0001a41f80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00028ec008 ffffea00026ffb08 ffff88812c3f0ac0 raw: 0000000000000000 ffff88806907e040 0000000100000007 0000000000000000 kobject: 'tx-0' (00000000815887f4): fill_kobj_path: path = '/devices/virtual/net/tunl0/queues/tx-0' page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806907e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806907e880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88806907e900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88806907e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806907ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================