RDX: 0000000000000001 RSI: 0000000020005f00 RDI: 0000000000000003
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000004d4b20 R14: 00000000004c907a R15: 0000000000000004
==================================================================
BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:375 [inline]
BUG: KASAN: use-after-free in tls_push_record+0x10b9/0x1480 net/tls/tls_sw.c:352
Write of size 1 at addr ffff8801a05a8000 by task syz-executor4/29453

CPU: 0 PID: 29453 Comm: syz-executor4 Not tainted 4.19.0-rc2+ #213
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:375 [inline]
 tls_push_record+0x10b9/0x1480 net/tls/tls_sw.c:352
 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:389
 tls_push_pending_closed_record+0x10c/0x150 net/tls/tls_main.c:203
 tls_complete_pending_work include/net/tls.h:305 [inline]
 tls_sk_proto_close+0x7e3/0xc30 net/tls/tls_main.c:260
 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+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
 get_signal+0x155e/0x1980 kernel/signal.c:2343
 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: 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:00007f7874484c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 0000000000000001 RBX: 00007f78744856d4 RCX: 00000000004572d9
RDX: 0000000000000001 RSI: 0000000020005f00 RDI: 0000000000000003
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000004d4b20 R14: 00000000004c907a R15: 0000000000000004

The buggy address belongs to the page:
page:ffffea0006816a00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea00066e6a08 ffff88021fffaef8 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801a05a7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801a05a7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801a05a8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8801a05a8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801a05a8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================