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BUG: KASAN: out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118
Read of size 8 at addr ffffc900016b77d0 by task syz-executor.4/27674

CPU: 1 PID: 27674 Comm: syz-executor.4 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 csd_lock_record+0xcb/0xe0 kernel/smp.c:118
 flush_smp_call_function_queue+0x285/0x730 kernel/smp.c:391
 __sysvec_call_function_single+0x98/0x490 arch/x86/kernel/smp.c:248
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_call_function_single+0xe0/0x120 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:strcmp+0x3a/0xb0 lib/string.c:363
Code: 48 89 fb 48 83 ec 08 eb 08 40 84 ed 74 5d 4c 89 e6 48 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 <38> d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2
RSP: 0018:ffffc900189ef2a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88809d9c9601 RCX: ffffc90011f05000
RDX: 0000000000000000 RSI: ffff88804d6823c0 RDI: ffff88809d9c9600
RBP: ffff888034af2a88 R08: 0000000000000001 R09: ffffffff8a619b4f
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88804d6823c0 R15: 0000000000000001
 led_trigger_register+0x110/0x410 drivers/leds/led-triggers.c:283
 ieee80211_led_init+0x3c6/0x800 net/mac80211/led.c:181
 ieee80211_register_hw+0x1731/0x3950 net/mac80211/main.c:1216
 mac80211_hwsim_new_radio+0x2351/0x4540 drivers/net/wireless/mac80211_hwsim.c:3183
 hwsim_new_radio_nl+0x93e/0xf8c drivers/net/wireless/mac80211_hwsim.c:3744
 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
 genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fbea011fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000005025a0 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a3c R14: 00000000004cd22e R15: 00007fbea01206d4


Memory state around the buggy address:
 ffffc900016b7680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900016b7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900016b7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                    ^
 ffffc900016b7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
 ffffc900016b7880: f1 f1 f1 00 00 f3 f3 00 00 00 00 00 00 00 00 00
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