==================================================================
BUG: KASAN: use-after-free in sha512_ctx_mgr_resubmit.part.3+0x3b1/0x4a0 arch/x86/crypto/sha512-mb/sha512_mb.c:136
Read of size 4 at addr ffff8801b0b9e838 by task kworker/0:1/13

CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 4.18.0+ #187
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: crypto mcryptd_flusher
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 sha512_ctx_mgr_resubmit.part.3+0x3b1/0x4a0 arch/x86/crypto/sha512-mb/sha512_mb.c:136
 sha512_ctx_mgr_resubmit arch/x86/crypto/sha512-mb/sha512_mb.c:135 [inline]
 sha512_ctx_mgr_flush+0x5c/0xb0 arch/x86/crypto/sha512-mb/sha512_mb.c:367
 sha512_mb_flusher+0x27b/0x610 arch/x86/crypto/sha512-mb/sha512_mb.c:939
 mcryptd_flusher+0x342/0x4b0 crypto/mcryptd.c:208
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413

Allocated by task 23902:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x14e/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:518 [inline]
 sock_kmalloc+0x156/0x1f0 net/core/sock.c:1996
 hash_accept_parent_nokey+0x58/0x2e0 crypto/algif_hash.c:438
 hash_accept_parent+0x5b/0x80 crypto/algif_hash.c:465
 af_alg_accept+0x127/0x7d0 crypto/af_alg.c:296
 alg_accept+0x46/0x60 crypto/af_alg.c:332
 __sys_accept4+0x3b2/0x8a0 net/socket.c:1600
 __do_sys_accept4 net/socket.c:1635 [inline]
 __se_sys_accept4 net/socket.c:1632 [inline]
 __x64_sys_accept4+0x97/0xf0 net/socket.c:1632
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 23902:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 __sock_kfree_s net/core/sock.c:2017 [inline]
 sock_kfree_s+0x29/0x60 net/core/sock.c:2023
 hash_sock_destruct+0x157/0x1c0 crypto/algif_hash.c:427
 __sk_destruct+0x107/0xa60 net/core/sock.c:1573
 sk_destruct+0x78/0x90 net/core/sock.c:1608
 __sk_free+0xcf/0x300 net/core/sock.c:1619
 sk_free+0x42/0x50 net/core/sock.c:1630
 sock_put include/net/sock.h:1667 [inline]
 af_alg_release+0x6e/0x90 crypto/af_alg.c:126
 __sock_release+0xd7/0x260 net/socket.c:600
 sock_close+0x19/0x20 net/socket.c:1151
 __fput+0x355/0x8b0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166
 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

The buggy address belongs to the object at ffff8801b0b9e340
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1272 bytes inside of
 2048-byte region [ffff8801b0b9e340, ffff8801b0b9eb40)
The buggy address belongs to the page:
page:ffffea0006c2e780 count:1 mapcount:0 mapping:ffff8801dac00c40 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0007543a88 ffffea000760b188 ffff8801dac00c40
raw: 0000000000000000 ffff8801b0b9e340 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b0b9e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b0b9e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801b0b9e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801b0b9e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b0b9e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================