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BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:368 [inline]
BUG: KASAN: use-after-free in tls_push_record+0x10b9/0x1480 net/tls/tls_sw.c:220
Write of size 1 at addr ffff8801a3d13f5c by task syz-executor1/15802

CPU: 0 PID: 15802 Comm: syz-executor1 Not tainted 4.19.0-rc3+ #102
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:368 [inline]
 tls_push_record+0x10b9/0x1480 net/tls/tls_sw.c:220
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:257
 tls_handle_open_record net/tls/tls_main.c:156 [inline]
 tls_sk_proto_close+0x69c/0xbb0 net/tls/tls_main.c:271
 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: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
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ad7/0x2610 kernel/exit.c:867
 do_group_exit+0x177/0x440 kernel/exit.c:970
 get_signal+0x8b0/0x1980 kernel/signal.c:2513
 do_signal+0x9c/0x21e0 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: 0033:0x4572d9
Code: Bad RIP value.
RSP: 002b:00007f9fb46bac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffe0 RBX: 00007f9fb46bb6d4 RCX: 00000000004572d9
RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000009
RBP: 00000000009301e0 R08: 0000000020000000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d5010 R14: 00000000004c94aa R15: 0000000000000002

The buggy address belongs to the page:
page:ffffea00068f44c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 ffffea00068f4488 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801a3d13e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801a3d13e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801a3d13f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                    ^
 ffff8801a3d13f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801a3d14000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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