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BUG: KASAN: use-after-free in tls_write_space+0x238/0x2d0 net/tls/tls_main.c:222
Read of size 1 at addr ffff888085731470 by task ksoftirqd/0/7

CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.194-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427
 tls_write_space+0x238/0x2d0 net/tls/tls_main.c:222
 tcp_new_space net/ipv4/tcp_input.c:5112 [inline]
 tcp_check_space+0x395/0x640 net/ipv4/tcp_input.c:5123
 tcp_data_snd_check net/ipv4/tcp_input.c:5133 [inline]
 tcp_rcv_state_process+0xcb6/0x494e net/ipv4/tcp_input.c:6173
 tcp_v6_do_rcv+0x3d5/0x1190 net/ipv6/tcp_ipv6.c:1326
 tcp_v6_rcv+0x24e2/0x33a0 net/ipv6/tcp_ipv6.c:1519
 ip6_input_finish+0x3e1/0x1570 net/ipv6/ip6_input.c:294
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip6_input+0xb9/0x300 net/ipv6/ip6_input.c:337
 dst_input include/net/dst.h:476 [inline]
 ip6_rcv_finish+0x23b/0x7a0 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ipv6_rcv+0xafe/0x1bd0 net/ipv6/ip6_input.c:218
 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474
 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512
 process_backlog+0x210/0x6f0 net/core/dev.c:5194
 napi_poll net/core/dev.c:5595 [inline]
 net_rx_action+0x466/0xfd0 net/core/dev.c:5661
 __do_softirq+0x254/0xa1d kernel/softirq.c:288
 run_ksoftirqd+0x50/0x1a0 kernel/softirq.c:670
 smpboot_thread_fn+0x5c1/0x920 kernel/smpboot.c:164
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 13887:
 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]
 tls_init+0xb1/0x4e0 net/tls/tls_main.c:518
 tcp_set_ulp+0x18f/0x4b6 net/ipv4/tcp_ulp.c:127
 do_tcp_setsockopt.constprop.0+0x1f6/0x1c10 net/ipv4/tcp.c:2547
 tcp_setsockopt net/ipv4/tcp.c:2830 [inline]
 tcp_setsockopt+0xa7/0xc0 net/ipv4/tcp.c:2822
 SYSC_setsockopt net/socket.c:1865 [inline]
 SyS_setsockopt+0x110/0x1e0 net/socket.c:1844
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 13883:
 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
 tls_ctx_free net/tls/tls_main.c:252 [inline]
 tls_ctx_free net/tls/tls_main.c:246 [inline]
 tls_sk_proto_close+0x568/0x8b0 net/tls/tls_main.c:290
 inet_release+0xdf/0x1b0 net/ipv4/af_inet.c:425
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:450
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 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+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff888085731400
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 112 bytes inside of
 192-byte region [ffff888085731400, ffff8880857314c0)
The buggy address belongs to the page:
page:ffffea000215cc40 count:1 mapcount:0 mapping:ffff888085731000 index:0xffff888085731c00
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff888085731000 ffff888085731c00 000000010000000e
raw: ffffea0002a31820 ffffea000228f4e0 ffff88812fe52040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888085731300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888085731380: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888085731400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888085731480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888085731500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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