netlink: 8 bytes leftover after parsing attributes in process `syz.4.2398'.
Oops: general protection fault, probably for non-canonical address 0xdffffc000000003b: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001d8-0x00000000000001df]
CPU: 0 UID: 0 PID: 13491 Comm: syz.4.2398 Not tainted 6.12.0-rc3-syzkaller-00140-g07d6bf634bc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__ethtool_get_link_ksettings+0x7e/0x190 net/ethtool/ioctl.c:442
Code: 03 00 00 4c 89 e5 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 e7 e8 42 74 29 f8 bb d8 01 00 00 49 03 1c 24 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 23 74 29 f8 48 83 3b 00 74 4d 49
RSP: 0018:ffffc900040f6b28 EFLAGS: 00010202
RAX: 000000000000003b RBX: 00000000000001d8 RCX: 0000000000040000
RDX: ffffc9000a25c000 RSI: 00000000000029a0 RDI: 00000000000029a1
RBP: 1ffff1100c5fac61 R08: ffffffff89d526b9 R09: 1ffffffff1f9a574
R10: dffffc0000000000 R11: fffffbfff1f9a575 R12: ffff888062fd6308
R13: dffffc0000000000 R14: ffffc900040f6ba0 R15: ffff888062fd6000
FS:  00007fa35f9b06c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d93308178 CR3: 000000002cde0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ib_get_eth_speed+0x160/0x800 drivers/infiniband/core/verbs.c:1996
 rxe_query_port+0x76/0x260 drivers/infiniband/sw/rxe/rxe_verbs.c:55
 __ib_query_port drivers/infiniband/core/device.c:2111 [inline]
 ib_query_port+0x166/0x7d0 drivers/infiniband/core/device.c:2143
 fill_port_info+0x24f/0x9f0 drivers/infiniband/core/nldev.c:356
 nldev_port_get_dumpit+0x547/0x8a0 drivers/infiniband/core/nldev.c:1311
 netlink_dump+0x647/0xd80 net/netlink/af_netlink.c:2326
 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2441
 netlink_dump_start include/linux/netlink.h:339 [inline]
 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:190 [inline]
 rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
 rdma_nl_rcv+0x796/0x9e0 drivers/infiniband/core/netlink.c:259
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2607
 ___sys_sendmsg net/socket.c:2661 [inline]
 __sys_sendmsg+0x292/0x380 net/socket.c:2690
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa35eb7dff9
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:00007fa35f9b0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa35ed35f80 RCX: 00007fa35eb7dff9
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 00007fa35ebf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa35ed35f80 R15: 00007ffd7867eec8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ethtool_get_link_ksettings+0x7e/0x190 net/ethtool/ioctl.c:442
Code: 03 00 00 4c 89 e5 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 e7 e8 42 74 29 f8 bb d8 01 00 00 49 03 1c 24 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 23 74 29 f8 48 83 3b 00 74 4d 49
RSP: 0018:ffffc900040f6b28 EFLAGS: 00010202
RAX: 000000000000003b RBX: 00000000000001d8 RCX: 0000000000040000
RDX: ffffc9000a25c000 RSI: 00000000000029a0 RDI: 00000000000029a1
RBP: 1ffff1100c5fac61 R08: ffffffff89d526b9 R09: 1ffffffff1f9a574
R10: dffffc0000000000 R11: fffffbfff1f9a575 R12: ffff888062fd6308
R13: dffffc0000000000 R14: ffffc900040f6ba0 R15: ffff888062fd6000
FS:  00007fa35f9b06c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d93308178 CR3: 000000002cde0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	03 00                	add    (%rax),%eax
   2:	00 4c 89 e5          	add    %cl,-0x1b(%rcx,%rcx,4)
   6:	48 c1 ed 03          	shr    $0x3,%rbp
   a:	42 80 7c 2d 00 00    	cmpb   $0x0,0x0(%rbp,%r13,1)
  10:	74 08                	je     0x1a
  12:	4c 89 e7             	mov    %r12,%rdi
  15:	e8 42 74 29 f8       	call   0xf829745c
  1a:	bb d8 01 00 00       	mov    $0x1d8,%ebx
  1f:	49 03 1c 24          	add    (%r12),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 23 74 29 f8       	call   0xf829745c
  39:	48 83 3b 00          	cmpq   $0x0,(%rbx)
  3d:	74 4d                	je     0x8c
  3f:	49                   	rex.WB