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BUG: KASAN: out-of-bounds in tls_fill_prepend include/net/tls.h:369 [inline]
BUG: KASAN: out-of-bounds in tls_push_record+0x10a9/0x1400 net/tls/tls_sw.c:214
Write of size 1 at addr ffff880166593f5c by task syz-executor6/17186

CPU: 1 PID: 17186 Comm: syz-executor6 Not tainted 4.18.0+ #196
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+0x242/0x30d mm/kasan/report.c:412
 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report.c:435
 tls_fill_prepend include/net/tls.h:369 [inline]
 tls_push_record+0x10a9/0x1400 net/tls/tls_sw.c:214
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:251
 tls_handle_open_record net/tls/tls_main.c:155 [inline]
 tls_sk_proto_close+0x759/0xb90 net/tls/tls_main.c:255
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:457
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1139
 __fput+0x39b/0x860 fs/file_table.c:251
 ____fput+0x15/0x20 fs/file_table.c:282
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1b25/0x2760 kernel/exit.c:865
 do_group_exit+0x177/0x440 kernel/exit.c:968
 get_signal+0x88e/0x1970 kernel/signal.c:2468
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 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
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1a0843acf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000930148 RCX: 0000000000457089
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000930148
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000093014c
R13: 0000000000a3fb9f R14: 00007f1a0843b9c0 R15: 0000000000000001

The buggy address belongs to the page:
page:ffffea00059964c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffea0005996488 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880166593e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff880166593e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff880166593f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff880166593f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff880166594000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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