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BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:409 [inline]
BUG: KASAN: use-after-free in tls_push_record+0x13c9/0x17f0 net/tls/tls_sw.c:576
Write of size 1 at addr ffff88019b6d76b0 by task syz-executor1/8320

CPU: 0 PID: 8320 Comm: syz-executor1 Not tainted 4.19.0-rc6+ #253
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+0x1c4/0x2b4 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report.c:435
 tls_fill_prepend include/net/tls.h:409 [inline]
 tls_push_record+0x13c9/0x17f0 net/tls/tls_sw.c:576
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:597
 tls_handle_open_record net/tls/tls_main.c:155 [inline]
 tls_sk_proto_close+0x439/0x750 net/tls/tls_main.c:272
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 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
RIP: 0033:0x411051
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd2e931d00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411051
RDX: 0000000000000000 RSI: 0000000000731130 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd2e931c30 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000023 R15: 0000000000000001

The buggy address belongs to the page:
page:ffffea00066db5c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffea00066db5c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88019b6d7580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88019b6d7600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88019b6d7680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff88019b6d7700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88019b6d7780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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