IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: use-after-free in u32_clear_hnode+0x37d/0x410 net/sched/cls_u32.c:590 Read of size 8 at addr ffff88808c1756b0 by task kworker/u4:5/4257 CPU: 1 PID: 4257 Comm: kworker/u4:5 Not tainted 4.14.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 u32_clear_hnode+0x37d/0x410 net/sched/cls_u32.c:590 u32_destroy+0x1e7/0x3f0 net/sched/cls_u32.c:655 tcf_proto_destroy net/sched/cls_api.c:180 [inline] tcf_chain_flush+0x147/0x2b0 net/sched/cls_api.c:208 tcf_block_put+0xd0/0x220 net/sched/cls_api.c:302 hfsc_destroy_qdisc+0xd8/0x350 net/sched/sch_hfsc.c:1504 qdisc_destroy+0x13c/0x310 net/sched/sch_generic.c:726 dev_shutdown+0x27a/0x43e net/sched/sch_generic.c:1001 rollback_registered_many+0x6e0/0xb30 net/core/dev.c:7196 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8284 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8283 ip_tunnel_delete_net+0x274/0x320 net/ipv4/ip_tunnel.c:1083 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 6386: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] u32_init+0x3e4/0x884 net/sched/cls_u32.c:367 tcf_proto_create net/sched/cls_api.c:166 [inline] tc_ctl_tfilter+0xde3/0x1c01 net/sched/cls_api.c:677 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4316 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x326/0x800 net/socket.c:2062 __sys_sendmmsg+0x129/0x330 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x2f/0x50 net/socket.c:2178 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 4257: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 u32_destroy_key.constprop.0.isra.0+0x105/0x1d0 net/sched/cls_u32.c:406 u32_clear_hnode+0x2de/0x410 net/sched/cls_u32.c:598 u32_destroy+0x1e7/0x3f0 net/sched/cls_u32.c:655 tcf_proto_destroy net/sched/cls_api.c:180 [inline] tcf_chain_flush+0x147/0x2b0 net/sched/cls_api.c:208 tcf_block_put+0xd0/0x220 net/sched/cls_api.c:302 hfsc_destroy_qdisc+0xd8/0x350 net/sched/sch_hfsc.c:1504 qdisc_destroy+0x13c/0x310 net/sched/sch_generic.c:726 dev_shutdown+0x27a/0x43e net/sched/sch_generic.c:1001 rollback_registered_many+0x6e0/0xb30 net/core/dev.c:7196 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8284 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8283 ip_tunnel_delete_net+0x274/0x320 net/ipv4/ip_tunnel.c:1083 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff88808c175680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of 64-byte region [ffff88808c175680, ffff88808c1756c0) The buggy address belongs to the page: page:ffffea0002305d40 count:1 mapcount:0 mapping:ffff88808c175000 index:0xffff88808c175f80 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88808c175000 ffff88808c175f80 000000010000001e raw: ffffea0002703120 ffffea00021e5520 ffff88812fe52340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808c175580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88808c175600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88808c175680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88808c175700: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff88808c175780: 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc fc ==================================================================