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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
Write of size 214 at addr ffff8801c6b090fc by task syz-executor1/21574

CPU: 1 PID: 21574 Comm: syz-executor1 Not tainted 4.15.0-rc5+ #237
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
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
 crypto_shash_update+0xda/0x240 crypto/shash.c:110
 hmac_update+0x7e/0xa0 crypto/hmac.c:122
 crypto_shash_update+0xda/0x240 crypto/shash.c:110
 kdf_ctr security/keys/dh.c:181 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:226 [inline]
 __keyctl_dh_compute+0x160f/0x1990 security/keys/dh.c:398
 keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
 SYSC_keyctl security/keys/keyctl.c:1741 [inline]
 SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1637
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f63392e3c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00007f63392e4700 RCX: 0000000000452ac9
RDX: 00000000205cd000 RSI: 00000000204c8ff4 RDI: 0000000000000017
RBP: 0000000000000000 R08: 0000000020550000 R09: 0000000000000000
R10: 0000000000000030 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f63392e49c0 R15: 0000000000000000

Allocated by task 21574:
 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
 __do_kmalloc mm/slab.c:3708 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3717
 kmalloc include/linux/slab.h:504 [inline]
 kdf_alloc security/keys/dh.c:111 [inline]
 __keyctl_dh_compute+0x2b0/0x1990 security/keys/dh.c:288
 keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
 SYSC_keyctl security/keys/keyctl.c:1741 [inline]
 SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1637
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 18428:
 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
 skb_free_head+0x74/0xb0 net/core/skbuff.c:550
 skb_release_data+0x58c/0x790 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 consume_skb+0x153/0x490 net/core/skbuff.c:701
 netlink_broadcast_filtered+0x5d0/0x1360 net/netlink/af_netlink.c:1477
 netlink_broadcast net/netlink/af_netlink.c:1499 [inline]
 nlmsg_multicast include/net/netlink.h:591 [inline]
 nlmsg_notify+0x91/0x150 net/netlink/af_netlink.c:2451
 rtnl_notify+0xbb/0xe0 net/core/rtnetlink.c:649
 rtmsg_ifa+0x178/0x1c0 net/ipv4/devinet.c:1715
 __inet_del_ifa+0x4a9/0xb00 net/ipv4/devinet.c:408
 inet_del_ifa net/ipv4/devinet.c:439 [inline]
 inetdev_destroy net/ipv4/devinet.c:304 [inline]
 inetdev_event+0x940/0x1240 net/ipv4/devinet.c:1529
 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93
 __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
 call_netdevice_notifiers_info+0x32/0x60 net/core/dev.c:1679
 call_netdevice_notifiers net/core/dev.c:1697 [inline]
 rollback_registered_many+0x8ad/0xdf0 net/core/dev.c:7243
 rollback_registered+0x1be/0x3c0 net/core/dev.c:7285
 unregister_netdevice_queue+0x2e3/0x5d0 net/core/dev.c:8273
 unregister_netdevice include/linux/netdevice.h:2462 [inline]
 __tun_detach+0x1177/0x1550 drivers/net/tun.c:658
 tun_detach drivers/net/tun.c:669 [inline]
 tun_chr_close+0x44/0x60 drivers/net/tun.c:2861
 __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
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96

The buggy address belongs to the object at ffff8801c6b09000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 252 bytes inside of
 512-byte region [ffff8801c6b09000, ffff8801c6b09200)
The buggy address belongs to the page:
page:000000000a2412b7 count:1 mapcount:0 mapping:0000000069bf85b7 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c6b09000 0000000000000000 0000000100000006
raw: ffffea00071b9ee0 ffffea00071ba520 ffff8801db000940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6b09080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6b09100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c6b09180: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff8801c6b09200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c6b09280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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