BUG: unable to handle kernel paging request in nl802154_del_llsec_key

* BUG: unable to handle kernel paging request in nl802154_del_llsec_key
@ 2021-02-18 19:24 syzbot
  2021-02-18 20:04 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2021-02-18 19:24 UTC (permalink / raw)
  To: alex.aring, davem, kuba, linux-kernel, linux-wpan, netdev,
	stefan, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    f40ddce8 Linux 5.11
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11261a4cd00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=67894355b1dbeb07
dashboard link: https://syzkaller.appspot.com/bug?extid=ac5c11d2959a8b3c4806
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com

netlink: 164 bytes leftover after parsing attributes in process `syz-executor.1'.
Unable to handle kernel paging request at virtual address dfff800000000000
Mem abort info:
  ESR = 0x96000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 96000004 [#1] PREEMPT SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5366 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0
Hardware name: linux,dummy-virt (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
pc : nla_len include/net/netlink.h:1148 [inline]
pc : nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
pc : nl802154_del_llsec_key+0x138/0x2c0 net/ieee802154/nl802154.c:1595
lr : genl_family_rcv_msg_doit+0x1b8/0x2a0 net/netlink/genetlink.c:739
sp : ffff000019c57280
x29: ffff000019c57280 x28: ffff80001aa29cc0 
x27: ffff000019c576d0 x26: ffff000012280000 
x25: 1fffe0000338aeb2 x24: 1fffe0000338ae84 
x23: ffff800018380c80 x22: ffff000016174c10 
x21: ffff00000fca8000 x20: 0000000000000000 
x19: 1fffe0000338ae5a x18: 0000000000000001 
x17: 0000000000000000 x16: 0000000000000000 
x15: 0000000000000000 x14: 1fffe0000338adf4 
x13: 0000000000000000 x12: ffff60000338ae55 
x11: 1fffe0000338ae54 x10: ffff60000338ae54 
x9 : 000000000000f1f1 x8 : 000000000000f2f2 
x7 : 00000000f3000000 x6 : 1fffe0000338ae90 
x5 : 00000000f3f3f3f3 x4 : 0000000000000000 
x3 : dfff800000000000 x2 : 0000000000000004 
x1 : ffff000019c57450 x0 : 0000000000000001 
Call trace:
 nla_data include/net/netlink.h:1139 [inline]
 nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
 nl802154_del_llsec_key+0x138/0x2c0 net/ieee802154/nl802154.c:1595
 genl_family_rcv_msg_doit+0x1b8/0x2a0 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x24c/0x430 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x198/0x34c net/netlink/af_netlink.c:2494
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x3e0/0x670 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x610/0xa20 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xc0/0xf4 net/socket.c:672
 ____sys_sendmsg+0x548/0x6d0 net/socket.c:2345
 ___sys_sendmsg+0xf4/0x170 net/socket.c:2399
 __sys_sendmsg+0xbc/0x14c net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg net/socket.c:2439 [inline]
 __arm64_sys_sendmsg+0x70/0xa0 net/socket.c:2439
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0x110/0x3c0 arch/arm64/kernel/syscall.c:159
 do_el0_svc+0xa4/0xd0 arch/arm64/kernel/syscall.c:198
 el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:365
 el0_sync_handler+0x1a4/0x1ac arch/arm64/kernel/entry-common.c:381
 el0_sync+0x174/0x180 arch/arm64/kernel/entry.S:699
Code: f2fbffe3 92400a80 11000400 91001282 (38e36883) 
---[ end trace dde92eef2b40d315 ]---

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