syzbot

IPVS: ftp: loaded support on port[0] = 21
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 7053 Comm: syz-executor549 Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_get_u8 include/net/netlink.h:1595 [inline]
RIP: 0010:erspan_validate+0x89/0x380 net/ipv4/ip_gre.c:1090
Code: c1 ea 03 80 3c 02 00 0f 85 c5 02 00 00 4c 8b a3 b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 04 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 9c 02 00 00
RSP: 0018:ffffc900018a7188 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88809e875800 RCX: ffffffff86b260fc
RDX: 0000000000000000 RSI: ffffffff86b2610a RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff888094b78300 R09: ffffffff88e65d12
R10: ffff88809e8758c7 R11: ffffed1013d0eb18 R12: 0000000000000000
R13: ffffc900018a7888 R14: ffffc900018a7428 R15: dffffc0000000000
FS:  0000000000d33880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000780 CR3: 00000000a6398000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __rtnl_newlink+0x526/0x1590 net/core/rtnetlink.c:3219
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461
 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362
 ___sys_sendmsg+0x100/0x170 net/socket.c:2416
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x440bc9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff8f61dd18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004a2370 RCX: 0000000000440bc9
RDX: 0000000000000000 RSI: 0000000020000780 RDI: 0000000000000003
RBP: 00007fff8f61dd20 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004a2370
R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e1a52bdbfee4b61b ]---
RIP: 0010:nla_get_u8 include/net/netlink.h:1595 [inline]
RIP: 0010:erspan_validate+0x89/0x380 net/ipv4/ip_gre.c:1090
Code: c1 ea 03 80 3c 02 00 0f 85 c5 02 00 00 4c 8b a3 b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 04 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 9c 02 00 00
RSP: 0018:ffffc900018a7188 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88809e875800 RCX: ffffffff86b260fc
RDX: 0000000000000000 RSI: ffffffff86b2610a RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff888094b78300 R09: ffffffff88e65d12
R10: ffff88809e8758c7 R11: ffffed1013d0eb18 R12: 0000000000000000
R13: ffffc900018a7888 R14: ffffc900018a7428 R15: dffffc0000000000
FS:  0000000000d33880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000780 CR3: 00000000a6398000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400