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+0x243/0x2a0 net/tls/tls_main.c:222
Read of size 1 at addr ffff8880a9dfda70 by task syz-executor874/32624

CPU: 1 PID: 32624 Comm: syz-executor874 Not tainted 4.14.151 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427
 tls_write_space+0x243/0x2a0 net/tls/tls_main.c:222
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 tcp_new_space net/ipv4/tcp_input.c:5099 [inline]
 tcp_check_space+0x3bb/0x670 net/ipv4/tcp_input.c:5110
 tcp_data_snd_check net/ipv4/tcp_input.c:5120 [inline]
 tcp_rcv_established+0x635/0x1650 net/ipv4/tcp_input.c:5566
 tcp_v6_do_rcv+0x417/0x1190 net/ipv6/tcp_ipv6.c:1301
 sk_backlog_rcv include/net/sock.h:912 [inline]
 __release_sock+0x12d/0x350 net/core/sock.c:2264
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 release_sock+0x59/0x1b0 net/core/sock.c:2779
 tls_sk_proto_close+0x14a/0x750 net/tls/tls_main.c:294
 inet_release+0xec/0x1c0 net/ipv4/af_inet.c:425
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:450
 __sock_release+0xce/0x2b0 net/socket.c:602
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 sock_close+0x1b/0x30 net/socket.c:1139
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x402d60
RSP: 002b:00007ffdf9baf298 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000402d60
RDX: fffffffffffffe5b RSI: 0000000020000080 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffffffffffe5b
R10: 0000000000000040 R11: 0000000000000246 R12: 00000000000010b1
R13: 0000000000000024 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 32624:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tls_init+0xb9/0x530 net/tls/tls_main.c:518
 tcp_set_ulp+0x196/0x4a1 net/ipv4/tcp_ulp.c:127
 do_tcp_setsockopt.isra.0+0x22f/0x1e10 net/ipv4/tcp.c:2536
 tcp_setsockopt+0xb3/0xd0 net/ipv4/tcp.c:2822
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:2968
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 SYSC_setsockopt net/socket.c:1865 [inline]
 SyS_setsockopt+0x13c/0x210 net/socket.c:1844
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 32624:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 tls_ctx_free net/tls/tls_main.c:252 [inline]
 tls_ctx_free net/tls/tls_main.c:246 [inline]
 tls_sk_proto_close+0x13d/0x750 net/tls/tls_main.c:290
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 inet_release+0xec/0x1c0 net/ipv4/af_inet.c:425
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:450
 __sock_release+0xce/0x2b0 net/socket.c:602
 sock_close+0x1b/0x30 net/socket.c:1139
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8880a9dfda00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 112 bytes inside of
 192-byte region [ffff8880a9dfda00, ffff8880a9dfdac0)
The buggy address belongs to the page:
page:ffffea0002a77f40 count:1 mapcount:0 mapping:ffff8880a9dfd000 index:0xffff8880a9dfdc00
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff8880a9dfd000 ffff8880a9dfdc00 000000010000000e
raw: ffffea0002837ce0 ffffea000284c1a0 ffff8880aa800040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9dfd900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9dfd980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880a9dfda00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 ffff8880a9dfda80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a9dfdb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
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.