RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000020000000 R09: 000000000000001c
R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000000005d8 R14: 00000000006fdce0 R15: 0000000000000002
==================================================================
BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:339 [inline]
BUG: KASAN: use-after-free in tls_push_record+0x1023/0x13e0 net/tls/tls_sw.c:240
Write of size 1 at addr ffff8801d9110000 by task syz-executor6/24359

CPU: 0 PID: 24359 Comm: syz-executor6 Not tainted 4.17.0-rc7+ #77
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+0x1b9/0x294 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_store1_noabort+0x17/0x20 mm/kasan/report.c:435
 tls_fill_prepend include/net/tls.h:339 [inline]
 tls_push_record+0x1023/0x13e0 net/tls/tls_sw.c:240
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:276
 tls_push_pending_closed_record+0x10c/0x150 net/tls/tls_main.c:211
 tls_complete_pending_work include/net/tls.h:277 [inline]
 tls_sk_proto_close+0x893/0xa70 net/tls/tls_main.c:263
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2482
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f00d8d1cce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000033 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007f00d8d1d9c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007644400 count:0 mapcount:-127 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffff80
raw: ffffea0006c27620 ffffea00073dae20 0000000000000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d910ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801d910ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801d9110000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8801d9110080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801d9110100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================