audit: type=1400 audit(1521459591.046:27920): avc:  denied  { create } for  pid=14667 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1
==================================================================
BUG: KASAN: use-after-free in strlen+0x85/0xa0 lib/string.c:482
Read of size 1 at addr ffff8801d71aee40 by task kworker/0:5/13957

CPU: 0 PID: 13957 Comm: kworker/0:5 Not tainted 4.16.0-rc6+ #359
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hwsim_wq destroy_radio
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23c/0x360 mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 strlen+0x85/0xa0 lib/string.c:482
 strlen include/linux/string.h:267 [inline]
 hwsim_mcast_del_radio drivers/net/wireless/mac80211_hwsim.c:2835 [inline]
 mac80211_hwsim_del_radio+0x168/0x3b0 drivers/net/wireless/mac80211_hwsim.c:2854
 destroy_radio+0x9d/0x100 drivers/net/wireless/mac80211_hwsim.c:3396
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406

Allocated by task 20367:
 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:552
 __do_kmalloc mm/slab.c:3705 [inline]
 __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3720
 kvasprintf+0xa9/0x130 lib/kasprintf.c:25
 kvasprintf_const+0x56/0x160 lib/kasprintf.c:49
 kobject_set_name_vargs+0x5b/0x140 lib/kobject.c:263
 dev_set_name+0xb4/0xf0 drivers/base/core.c:1649
 wiphy_new_nm+0x910/0x21d0 net/wireless/core.c:451
 ieee80211_alloc_hw_nm+0x4b4/0x2180 net/mac80211/main.c:531
 mac80211_hwsim_new_radio+0x227/0x2cd0 drivers/net/wireless/mac80211_hwsim.c:2537
 hwsim_new_radio_nl+0x67a/0x8c0 drivers/net/wireless/mac80211_hwsim.c:3213
 genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:599
 genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:624
 netlink_rcv_skb+0x14b/0x380 net/netlink/af_netlink.c:2444
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:635
 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
 netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
 __sys_sendmsg+0xe5/0x210 net/socket.c:2080
 SYSC_sendmsg net/socket.c:2091 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2087
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 31497:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 kfree_const+0x31/0x40 mm/util.c:38
 kobject_rename+0x1b3/0x2a0 lib/kobject.c:501
 device_rename+0x147/0x1f0 drivers/base/core.c:2648
 cfg80211_switch_netns+0x1fa/0x470 net/wireless/core.c:192
 cfg80211_pernet_exit+0x93/0xc0 net/wireless/core.c:1336
 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
 cleanup_net+0x6a1/0xcb0 net/core/net_namespace.c:517
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406

The buggy address belongs to the object at ffff8801d71aee40
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801d71aee40, ffff8801d71aee60)
The buggy address belongs to the page:
page:ffffea00075c6b80 count:1 mapcount:0 mapping:ffff8801d71ae000 index:0xffff8801d71aefc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d71ae000 ffff8801d71aefc1 000000010000003d
raw: ffffea00075e5a20 ffffea0006af8a60 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d71aed00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d71aed80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d71aee00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                                           ^
 ffff8801d71aee80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d71aef00: 00 02 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================