Re: BUG: unable to handle kernel paging request in nl802154_del_llsec_key

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    3af409ca net: enetc: fix destroyed phylink dereference dur..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=12ee9f72d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8cb23303ddb9411f
dashboard link: https://syzkaller.appspot.com/bug?extid=ac5c11d2959a8b3c4806
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1201ac0cd00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1307734ad00000

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

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 8434 Comm: syz-executor691 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
RIP: 0010:nl802154_del_llsec_key+0x16d/0x320 net/ieee802154/nl802154.c:1595
Code: 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ab 01 00 00 48 8b 93 28 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 d1 48 c1 e9 03 <0f> b6 0c 01 48 89 d0 83 e0 07 83 c0 01 38 c8 7c 08 84 c9 0f 85 16
RSP: 0018:ffffc90001abf528 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88801847fc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88892647 RDI: ffff88801847fd28
RBP: 1ffff92000357ea6 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8731625a R11: 0000000000000000 R12: ffff888144a80000
R13: ffff8881448fcbd0 R14: ffffc90001abf8b0 R15: 0000000000000000
FS:  0000000001d99300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000048 CR3: 0000000015550000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43f909
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3305ef28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043f909
RDX: 0000000020000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000403370 R08: 000000000000000c R09: 00000000004004a0
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000403400
R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0
Modules linked in:
---[ end trace e812501a57df1749 ]---
RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
RIP: 0010:nl802154_del_llsec_key+0x16d/0x320 net/ieee802154/nl802154.c:1595
Code: 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ab 01 00 00 48 8b 93 28 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 d1 48 c1 e9 03 <0f> b6 0c 01 48 89 d0 83 e0 07 83 c0 01 38 c8 7c 08 84 c9 0f 85 16
RSP: 0018:ffffc90001abf528 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88801847fc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88892647 RDI: ffff88801847fd28
RBP: 1ffff92000357ea6 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8731625a R11: 0000000000000000 R12: ffff888144a80000
R13: ffff8881448fcbd0 R14: ffffc90001abf8b0 R15: 0000000000000000
FS:  0000000001d99300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f152c03e068 CR3: 0000000015550000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400