BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000011e4fc067 P4D 800000011e4fc067 PUD 11f11f067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 UID: 0 PID: 4839 Comm: syz.0.15 Not tainted 6.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:ethnl_phy_doit+0x10e/0x370 net/ethtool/phy.c:167
Code: b3 e0 04 00 00 4c 89 ff e8 1f fc 74 00 48 89 44 24 20 eb 0f e8 53 81 c1 fe e9 26 01 00 00 e8 49 81 c1 fe 31 db 48 8b 44 24 20 <4c> 8b 60 18 4d 85 e4 74 33 e8 94 1d e9 ff 49 8b 9c 24 d0 04 00 00
RSP: 0018:ffffc90001de3928 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811f688000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88811e53ea90 R08: ffffffff82728822 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888105fe4a00
R13: 0000000000000000 R14: ffffc90001de39f8 R15: 0000000000000000
FS:  00007f5967f696c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000011d442000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x51f/0x5c0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0xe8/0x1c0 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x488/0x550 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x4e1/0x5c0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xca/0xf0 net/socket.c:745
 ____sys_sendmsg+0x26e/0x360 net/socket.c:2597
 ___sys_sendmsg+0x2f0/0x330 net/socket.c:2651
 __sys_sendmsg net/socket.c:2680 [inline]
 __do_sys_sendmsg net/socket.c:2689 [inline]
 __se_sys_sendmsg+0x145/0x1c0 net/socket.c:2687
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59684edef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5967f69038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f59686a5f80 RCX: 00007f59684edef9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00007f59685609f6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f59686a5f80 R15: 00007ffd75092738
 </TASK>
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:ethnl_phy_doit+0x10e/0x370 net/ethtool/phy.c:167
Code: b3 e0 04 00 00 4c 89 ff e8 1f fc 74 00 48 89 44 24 20 eb 0f e8 53 81 c1 fe e9 26 01 00 00 e8 49 81 c1 fe 31 db 48 8b 44 24 20 <4c> 8b 60 18 4d 85 e4 74 33 e8 94 1d e9 ff 49 8b 9c 24 d0 04 00 00
RSP: 0018:ffffc90001de3928 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811f688000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88811e53ea90 R08: ffffffff82728822 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888105fe4a00
R13: 0000000000000000 R14: ffffc90001de39f8 R15: 0000000000000000
FS:  00007f5967f696c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000011d442000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	b3 e0                	mov    $0xe0,%bl
   2:	04 00                	add    $0x0,%al
   4:	00 4c 89 ff          	add    %cl,-0x1(%rcx,%rcx,4)
   8:	e8 1f fc 74 00       	call   0x74fc2c
   d:	48 89 44 24 20       	mov    %rax,0x20(%rsp)
  12:	eb 0f                	jmp    0x23
  14:	e8 53 81 c1 fe       	call   0xfec1816c
  19:	e9 26 01 00 00       	jmp    0x144
  1e:	e8 49 81 c1 fe       	call   0xfec1816c
  23:	31 db                	xor    %ebx,%ebx
  25:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
* 2a:	4c 8b 60 18          	mov    0x18(%rax),%r12 <-- trapping instruction
  2e:	4d 85 e4             	test   %r12,%r12
  31:	74 33                	je     0x66
  33:	e8 94 1d e9 ff       	call   0xffe91dcc
  38:	49 8b 9c 24 d0 04 00 	mov    0x4d0(%r12),%rbx
  3f:	00