syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc00000a2403: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000000512018-0x000000000051201f]
CPU: 0 UID: 0 PID: 5321 Comm: syz-executor670 Not tainted 6.14.0-rc4-syzkaller-00248-g03d38806a902 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
RIP: 0010:__smc_diag_dump net/smc/smc_diag.c:89 [inline]
RIP: 0010:smc_diag_dump_proto+0x6d7/0x3280 net/smc/smc_diag.c:217
Code: 80 3c 2f 00 74 08 48 89 df e8 a5 01 76 f6 48 89 5c 24 28 48 8b 1b 48 85 db 0f 84 51 02 00 00 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 7a 01 76 f6 48 8b 44 24 18 4c 8d
RSP: 0018:ffffc9000d06ee80 EFLAGS: 00010206
RAX: 00000000000a2403 RBX: 0000000000512018 RCX: ffff888000c2a440
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffffc9000d06f310 R08: ffffffff89da7bf2 R09: 1ffff11008f8278b
R10: dffffc0000000000 R11: ffffed1008f8278c R12: ffff888047c20000
R13: dffffc0000000000 R14: ffff888047c13c00 R15: 1ffff11008f8282b
FS:  00007f01d3fe56c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000040000000e000 CR3: 000000003609e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 smc_diag_dump+0x59/0xa0 net/smc/smc_diag.c:236
 netlink_dump+0x64d/0xe10 net/netlink/af_netlink.c:2308
 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2423
 netlink_dump_start include/linux/netlink.h:340 [inline]
 smc_diag_handler_dump+0x1ab/0x250 net/smc/smc_diag.c:251
 sock_diag_rcv_msg+0x3dc/0x5f0
 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2533
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2659
 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: 0033:0x7f01d402a519
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f01d3fe5218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f01d402a519
RDX: 0000000000000600 RSI: 0000400000000540 RDI: 0000000000000024
RBP: 00007f01d40b4308 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f01d40b4300
R13: 00004000000000c0 R14: 0000400000000340 R15: 0000400000000550
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
RIP: 0010:__smc_diag_dump net/smc/smc_diag.c:89 [inline]
RIP: 0010:smc_diag_dump_proto+0x6d7/0x3280 net/smc/smc_diag.c:217
Code: 80 3c 2f 00 74 08 48 89 df e8 a5 01 76 f6 48 89 5c 24 28 48 8b 1b 48 85 db 0f 84 51 02 00 00 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 7a 01 76 f6 48 8b 44 24 18 4c 8d
RSP: 0018:ffffc9000d06ee80 EFLAGS: 00010206
RAX: 00000000000a2403 RBX: 0000000000512018 RCX: ffff888000c2a440
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffffc9000d06f310 R08: ffffffff89da7bf2 R09: 1ffff11008f8278b
R10: dffffc0000000000 R11: ffffed1008f8278c R12: ffff888047c20000
R13: dffffc0000000000 R14: ffff888047c13c00 R15: 1ffff11008f8282b
FS:  00007f01d3fe56c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000040000000e000 CR3: 000000003609e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	80 3c 2f 00          	cmpb   $0x0,(%rdi,%rbp,1)
   4:	74 08                	je     0xe
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 a5 01 76 f6       	call   0xf67601b3
   e:	48 89 5c 24 28       	mov    %rbx,0x28(%rsp)
  13:	48 8b 1b             	mov    (%rbx),%rbx
  16:	48 85 db             	test   %rbx,%rbx
  19:	0f 84 51 02 00 00    	je     0x270
  1f:	48 83 c3 18          	add    $0x18,%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 7a 01 76 f6       	call   0xf67601b3
  39:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  3e:	4c                   	rex.WR
  3f:	8d                   	.byte 0x8d