netlink: 'syz.6.2512': attribute type 16 has an invalid length. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000055: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] CPU: 0 UID: 0 PID: 14112 Comm: syz.6.2512 Not tainted 6.15.0-rc1-syzkaller-00321-g0f2be57686c7 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:rtnl_create_link+0x6b8/0xea0 net/core/rtnetlink.c:3681 Code: 24 10 42 80 3c 28 00 74 08 48 89 df e8 01 3c 3a f8 4c 89 64 24 28 bd a8 02 00 00 48 89 5c 24 18 48 03 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 d9 3b 3a f8 45 31 e4 48 83 7d 00 RSP: 0018:ffffc9001658ee70 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff88806b620008 RCX: 0000000000080000 RDX: ffffc9000e870000 RSI: 00000000000027aa RDI: 00000000000027ab RBP: 00000000000002a8 R08: ffffffff89f34192 R09: 1ffff92002cb1dfa R10: dffffc0000000000 R11: fffff52002cb1dfb R12: ffff888021f89080 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88806b620000 FS: 00007f1ffef586c0(0000) GS:ffff888124fa5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c28e474 CR3: 00000000833c0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rtnl_newlink_create+0x2f2/0xc30 net/core/rtnetlink.c:3827 __rtnl_newlink net/core/rtnetlink.c:3954 [inline] rtnl_newlink+0x18b0/0x1fe0 net/core/rtnetlink.c:4069 rtnetlink_rcv_msg+0x80f/0xd70 net/core/rtnetlink.c:6959 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ffe18e169 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:00007f1ffef58038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1ffe3b5fa0 RCX: 00007f1ffe18e169 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000010 RBP: 00007f1ffe210a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1ffe3b5fa0 R15: 00007ffff46eb388 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:rtnl_create_link+0x6b8/0xea0 net/core/rtnetlink.c:3681 Code: 24 10 42 80 3c 28 00 74 08 48 89 df e8 01 3c 3a f8 4c 89 64 24 28 bd a8 02 00 00 48 89 5c 24 18 48 03 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 d9 3b 3a f8 45 31 e4 48 83 7d 00 RSP: 0018:ffffc9001658ee70 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff88806b620008 RCX: 0000000000080000 RDX: ffffc9000e870000 RSI: 00000000000027aa RDI: 00000000000027ab RBP: 00000000000002a8 R08: ffffffff89f34192 R09: 1ffff92002cb1dfa R10: dffffc0000000000 R11: fffff52002cb1dfb R12: ffff888021f89080 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88806b620000 FS: 00007f1ffef586c0(0000) GS:ffff888124fa5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fd7f56d58 CR3: 00000000833c0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 10 and $0x10,%al 2: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 01 3c 3a f8 call 0xf83a3c12 11: 4c 89 64 24 28 mov %r12,0x28(%rsp) 16: bd a8 02 00 00 mov $0x2a8,%ebp 1b: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 20: 48 03 2b add (%rbx),%rbp 23: 48 89 e8 mov %rbp,%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 ef mov %rbp,%rdi 34: e8 d9 3b 3a f8 call 0xf83a3c12 39: 45 31 e4 xor %r12d,%r12d 3c: 48 rex.W 3d: 83 .byte 0x83 3e: 7d 00 jge 0x40