TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: use-after-free in tls_write_space+0x2c2/0x360 net/tls/tls_main.c:225
Read of size 1 at addr ffff8801cd3fee20 by task ksoftirqd/1/18

CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.18.0-rc4+ #138
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 tls_write_space+0x2c2/0x360 net/tls/tls_main.c:225
 tcp_new_space net/ipv4/tcp_input.c:5069 [inline]
 tcp_check_space+0x551/0x930 net/ipv4/tcp_input.c:5080
 tcp_data_snd_check net/ipv4/tcp_input.c:5090 [inline]
 tcp_rcv_established+0x8a3/0x2070 net/ipv4/tcp_input.c:5564
 tcp_v6_do_rcv+0x421/0x13a0 net/ipv6/tcp_ipv6.c:1325
 tcp_v6_rcv+0x342a/0x3a70 net/ipv6/tcp_ipv6.c:1554
 ip6_input_finish+0x407/0x1a40 net/ipv6/ip6_input.c:284
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x2ab/0xa30 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ipv6_rcv+0xec0/0x2060 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x2488/0x3680 net/core/dev.c:4628
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4693
 process_backlog+0x219/0x760 net/core/dev.c:5373
 napi_poll net/core/dev.c:5771 [inline]
 net_rx_action+0x7da/0x1980 net/core/dev.c:5837
 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288
 run_ksoftirqd+0x86/0x100 kernel/softirq.c:649
 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

Allocated by task 13174:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
 kmalloc include/linux/slab.h:513 [inline]
 kzalloc include/linux/slab.h:707 [inline]
 create_ctx net/tls/tls_main.c:535 [inline]
 tls_init+0x1e7/0xb20 net/tls/tls_main.c:659
 tcp_set_ulp+0x1bc/0x520 net/ipv4/tcp_ulp.c:153
 do_tcp_setsockopt.isra.41+0x44a/0x2680 net/ipv4/tcp.c:2751
 tcp_setsockopt+0xc1/0xe0 net/ipv4/tcp.c:3062
 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3040
 __sys_setsockopt+0x1c5/0x3b0 net/socket.c:1911
 __do_sys_setsockopt net/socket.c:1922 [inline]
 __se_sys_setsockopt net/socket.c:1919 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1919
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 13174:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 tls_sk_proto_close+0x712/0xae0 net/tls/tls_main.c:297
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
 __sock_release+0xd7/0x260 net/socket.c:599
 sock_close+0x19/0x20 net/socket.c:1150
 __fput+0x355/0x8b0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801cd3fed40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 224 bytes inside of
 512-byte region [ffff8801cd3fed40, ffff8801cd3fef40)
The buggy address belongs to the page:
page:ffffea000734ff80 count:1 mapcount:0 mapping:ffff8801da800940 index:0xffff8801cd3fe0c0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0007332988 ffffea0007475048 ffff8801da800940
raw: ffff8801cd3fe0c0 ffff8801cd3fe0c0 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cd3fed00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801cd3fed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801cd3fee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8801cd3fee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cd3fef00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================