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BUG: KASAN: use-after-free in tls_sk_proto_close+0x7a0/0x800 net/tls/tls_main.c:229
Read of size 8 at addr ffff8801c6208d88 by task syz-executor2/26251

CPU: 0 PID: 26251 Comm: syz-executor2 Not tainted 4.15.0-rc7+ #192
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 tls_sk_proto_close+0x7a0/0x800 net/tls/tls_main.c:229
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 sock_release+0x8d/0x1e0 net/socket.c:595
 sock_close+0x16/0x20 net/socket.c:1123
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452df9
RSP: 002b:0000000000a2fa08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000071bf80 RCX: 0000000000452df9
RDX: 000000000047e461 RSI: 0000000000720850 RDI: 0000000000000000
RBP: 00000000000000b8 R08: 0000000000000000 R09: 0000000000004bca
R10: 0000000000000008 R11: 0000000000000202 R12: 0000000000a2f9b0
R13: 000000000071bf58 R14: 0000000000000331 R15: 0000000000000008

Allocated by task 26254:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3610
 kmalloc include/linux/slab.h:499 [inline]
 kzalloc include/linux/slab.h:688 [inline]
 tls_init+0x4b/0x240 net/tls/tls_main.c:458
 tcp_set_ulp+0x159/0x3e0 net/ipv4/tcp_ulp.c:127
 do_tcp_setsockopt.isra.37+0x316/0x2130 net/ipv4/tcp.c:2571
 tcp_setsockopt+0xb0/0xd0 net/ipv4/tcp.c:2874
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978
 SYSC_setsockopt net/socket.c:1823 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1802
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 26251:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 tls_sk_proto_close+0x4bf/0x800 net/tls/tls_main.c:232
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 sock_release+0x8d/0x1e0 net/socket.c:595
 sock_close+0x16/0x20 net/socket.c:1123
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801c6208d00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 136 bytes inside of
 192-byte region [ffff8801c6208d00, ffff8801c6208dc0)
The buggy address belongs to the page:
page:ffffea0007188200 count:1 mapcount:0 mapping:ffff8801c6208000 index:0xffff8801c6208a00
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c6208000 ffff8801c6208a00 000000010000000f
raw: ffffea0007196e60 ffffea00074ec0e0 ffff8801dac00040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6208c80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c6208d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c6208d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                      ^
 ffff8801c6208e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c6208e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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