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BUG: KASAN: use-after-free in tls_write_space+0x14b/0x170 net/tls/tls_main.c:239
Read of size 1 at addr ffff888095e5b06a by task syz-executor.4/14368

CPU: 1 PID: 14368 Comm: syz-executor.4 Not tainted 5.3.0-rc2+ #87
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
 kasan_report+0x12/0x17 mm/kasan/common.c:612
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129
 tls_write_space+0x14b/0x170 net/tls/tls_main.c:239
 tcp_new_space net/ipv4/tcp_input.c:5151 [inline]
 tcp_check_space+0x191/0x760 net/ipv4/tcp_input.c:5162
 tcp_data_snd_check net/ipv4/tcp_input.c:5172 [inline]
 tcp_rcv_established+0x9c1/0x1e70 net/ipv4/tcp_input.c:5663
 tcp_v6_do_rcv+0x41e/0x12c0 net/ipv6/tcp_ipv6.c:1356
 sk_backlog_rcv include/net/sock.h:945 [inline]
 __release_sock+0x129/0x390 net/core/sock.c:2418
 release_sock+0x59/0x1c0 net/core/sock.c:2934
 tls_sk_proto_close+0x282/0x6b0 net/tls/tls_main.c:313
 inet_release+0xed/0x200 net/ipv4/af_inet.c:427
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470
 __sock_release+0xce/0x280 net/socket.c:590
 sock_close+0x1e/0x30 net/socket.c:1268
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 get_signal+0x2078/0x2500 kernel/signal.c:2523
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe7d9191c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: 000000000026c000 RBX: 0000000000000006 RCX: 0000000000459829
RDX: ffffffffffffffc1 RSI: 00000000200005c0 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 1201000000003618
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7d91926d4
R13: 00000000004c77d9 R14: 00000000004dcf90 R15: 00000000ffffffff

Allocated by task 14368:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 create_ctx+0x46/0x1f0 net/tls/tls_main.c:602
 tls_init net/tls/tls_main.c:788 [inline]
 tls_init+0x11d/0x510 net/tls/tls_main.c:770
 __tcp_set_ulp net/ipv4/tcp_ulp.c:126 [inline]
 tcp_set_ulp+0x330/0x640 net/ipv4/tcp_ulp.c:147
 do_tcp_setsockopt.isra.0+0x363/0x24f0 net/ipv4/tcp.c:2808
 tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3135
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3130
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 14368:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3756
 tls_ctx_free.part.0+0x3a/0x40 net/tls/tls_main.c:261
 tls_ctx_free net/tls/tls_main.c:256 [inline]
 tls_sk_proto_close+0x275/0x6b0 net/tls/tls_main.c:308
 inet_release+0xed/0x200 net/ipv4/af_inet.c:427
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470
 __sock_release+0xce/0x280 net/socket.c:590
 sock_close+0x1e/0x30 net/socket.c:1268
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 get_signal+0x2078/0x2500 kernel/signal.c:2523
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888095e5b000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 106 bytes inside of
 512-byte region [ffff888095e5b000, ffff888095e5b200)
The buggy address belongs to the page:
page:ffffea00025796c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0xffff888095e5ba00
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002487e88 ffffea00025e6948 ffff8880aa400a80
raw: ffff888095e5ba00 ffff888095e5b000 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888095e5af00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888095e5af80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888095e5b000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff888095e5b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888095e5b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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