netlink: 'syz.1.1091': attribute type 4 has an invalid length.
==================================================================
BUG: KASAN: slab-out-of-bounds in xfrm_alloc_spi+0x570/0xf30
Read of size 4 at addr ffff888110fc5bc4 by task syz.1.1091/9755

CPU: 0 UID: 0 PID: 9755 Comm: syz.1.1091 Not tainted 6.16.0-syzkaller-06600-g1dbf1d590d10-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 xfrm_alloc_spi+0x570/0xf30
 xfrm_alloc_userspi+0x70b/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76aa98eb69
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:00007f76ab877038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f76aabb5fa0 RCX: 00007f76aa98eb69
RDX: 0000000000000000 RSI: 0000200000000540 RDI: 0000000000000003
RBP: 00007f76aaa11df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f76aabb5fa0 R15: 00007ffd16f724f8
 </TASK>

Allocated by task 6836:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 inet6_rt_notify+0x170/0x470
 fib6_add_rt2node+0x1876/0x33a0
 fib6_add+0x8da/0x18a0
 ip6_ins_rt+0xc8/0x120
 __ipv6_ifa_notify+0x63f/0xac0
 addrconf_dad_completed+0x180/0xd60
 addrconf_dad_work+0xc36/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Freed by task 6836:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 skb_release_data+0x62d/0x7c0
 consume_skb+0x9e/0xf0
 netlink_broadcast_filtered+0x1188/0x12c0
 nlmsg_notify+0xf0/0x1a0
 fib6_add_rt2node+0x1876/0x33a0
 fib6_add+0x8da/0x18a0
 ip6_ins_rt+0xc8/0x120
 __ipv6_ifa_notify+0x63f/0xac0
 addrconf_dad_completed+0x180/0xd60
 addrconf_dad_work+0xc36/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff888110fc5880
 which belongs to the cache skbuff_small_head of size 704
The buggy address is located 132 bytes to the right of
 allocated 704-byte region [ffff888110fc5880, ffff888110fc5b40)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110fc4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801d2e0c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000120012 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801d2e0c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000000120012 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000443f101 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/1), ts 107925305891, free_ts 107858787326
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x3b0
 ___slab_alloc+0xbfc/0x1480
 kmem_cache_alloc_node_noprof+0x280/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 arp_create+0x189/0x990
 arp_send_dst+0xa7/0x2d0
 arp_solicit+0xc1d/0xe60
 neigh_timer_handler+0x8f9/0x1150
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
page last free pid 9643 tgid 9643 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __folio_put+0x21b/0x2c0
 free_large_kmalloc+0x145/0x200
 device_release+0x9c/0x1c0
 kobject_put+0x22b/0x480
 netdev_run_todo+0xd2e/0xea0
 tun_chr_close+0x13c/0x1c0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888110fc5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888110fc5b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888110fc5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff888110fc5c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888110fc5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
