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BUG: KASAN: use-after-free in tls_write_space+0x10f/0x130 /net/tls/tls_main.c:239
Read of size 1 at addr ffff888090c75daa by task syz-executor.0/17334

CPU: 1 PID: 17334 Comm: syz-executor.0 Not tainted 5.2.0+ #37
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+0x1d8/0x2f8 /lib/dump_stack.c:113
 print_address_description+0x75/0x5b0 /mm/kasan/report.c:351
 __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482
 kasan_report+0x26/0x50 /mm/kasan/common.c:612
 __asan_report_load1_noabort+0x14/0x20 /mm/kasan/generic_report.c:129
 tls_write_space+0x10f/0x130 /net/tls/tls_main.c:239
 tcp_new_space /net/ipv4/tcp_input.c:5151 [inline]
 tcp_check_space /net/ipv4/tcp_input.c:5162 [inline]
 tcp_data_snd_check+0x1f3/0x2b0 /net/ipv4/tcp_input.c:5172
 tcp_rcv_established+0xcad/0x20e0 /net/ipv4/tcp_input.c:5663
 tcp_v6_do_rcv+0x4de/0x12c0 /net/ipv6/tcp_ipv6.c:1356
 sk_backlog_rcv /./include/net/sock.h:945 [inline]
 __release_sock+0x1c1/0x4b0 /net/core/sock.c:2418
 release_sock+0x65/0x1d0 /net/core/sock.c:2934
 tls_sk_proto_close+0x18a/0x5b0 /net/tls/tls_main.c:313
 inet_release+0x165/0x1c0 /net/ipv4/af_inet.c:427
 inet6_release+0x57/0x70 /net/ipv6/af_inet6.c:470
 __sock_release /net/socket.c:590 [inline]
 sock_close+0xe1/0x260 /net/socket.c:1268
 __fput+0x2e4/0x740 /fs/file_table.c:280
 ____fput+0x15/0x20 /fs/file_table.c:313
 task_work_run+0x17e/0x1c0 /kernel/task_work.c:113
 tracehook_notify_resume /./include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop /arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x459/0x580 /arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 /arch/x86/entry/common.c:274
 do_syscall_64+0x126/0x140 /arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413511
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 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:00007ffea00985c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000413511
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 0000000000000001 R08: 000000004e13a06c R09: 000000004e13a070
R10: 00007ffea00986a0 R11: 0000000000000293 R12: 000000000075bf20
R13: 00000000002294e1 R14: 0000000000761718 R15: ffffffffffffffff

Allocated by task 17341:
 save_stack /mm/kasan/common.c:69 [inline]
 set_track /mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487
 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501
 kmem_cache_alloc_trace+0x215/0x2f0 /mm/slab.c:3550
 kmalloc /./include/linux/slab.h:552 [inline]
 kzalloc /./include/linux/slab.h:748 [inline]
 create_ctx /net/tls/tls_main.c:602 [inline]
 tls_init+0x138/0x6e0 /net/tls/tls_main.c:788
 __tcp_set_ulp /net/ipv4/tcp_ulp.c:126 [inline]
 tcp_set_ulp+0x456/0x500 /net/ipv4/tcp_ulp.c:147
 do_tcp_setsockopt+0x291/0x2960 /net/ipv4/tcp.c:2808
 tcp_setsockopt+0x4e/0xd0 /net/ipv4/tcp.c:3135
 sock_common_setsockopt+0x99/0xb0 /net/core/sock.c:3130
 __sys_setsockopt+0x683/0x870 /net/socket.c:2084
 __do_sys_setsockopt /net/socket.c:2100 [inline]
 __se_sys_setsockopt /net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 /net/socket.c:2097
 do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 17334:
 save_stack /mm/kasan/common.c:69 [inline]
 set_track /mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457
 __cache_free /mm/slab.c:3425 [inline]
 kfree+0x115/0x200 /mm/slab.c:3756
 tls_ctx_free /net/tls/tls_main.c:261 [inline]
 tls_sk_proto_close+0x3f5/0x5b0 /net/tls/tls_main.c:308
 inet_release+0x165/0x1c0 /net/ipv4/af_inet.c:427
 inet6_release+0x57/0x70 /net/ipv6/af_inet6.c:470
 __sock_release /net/socket.c:590 [inline]
 sock_close+0xe1/0x260 /net/socket.c:1268
 __fput+0x2e4/0x740 /fs/file_table.c:280
 ____fput+0x15/0x20 /fs/file_table.c:313
 task_work_run+0x17e/0x1c0 /kernel/task_work.c:113
 tracehook_notify_resume /./include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop /arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x459/0x580 /arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 /arch/x86/entry/common.c:274
 do_syscall_64+0x126/0x140 /arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888090c75d40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 106 bytes inside of
 512-byte region [ffff888090c75d40, ffff888090c75f40)
The buggy address belongs to the page:
page:ffffea0002431d40 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00029ddf88 ffffea000280f848 ffff8880aa400a80
raw: 0000000000000000 ffff888090c750c0 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888090c75c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888090c75d00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff888090c75d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888090c75e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888090c75e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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