netlink: 'syz.2.1515': attribute type 29 has an invalid length.
netlink: 'syz.2.1515': attribute type 29 has an invalid length.
==================================================================
BUG: KASAN: use-after-free in xfrm_alloc_spi+0x570/0xf30
Read of size 4 at addr ffff8880326d09c4 by task syz.2.1515/11179

CPU: 0 UID: 0 PID: 11179 Comm: syz.2.1515 Not tainted syzkaller #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: 0033:0x7f11c298ebe9
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:00007f11c38cf038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f11c2bc5fa0 RCX: 00007f11c298ebe9
RDX: 0000000000000000 RSI: 0000200000000840 RDI: 0000000000000004
RBP: 00007f11c2a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11c2bc6038 R14: 00007f11c2bc5fa0 R15: 00007ffc5bbe1988
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880326d0400 pfn:0x326d0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea0000c8dc08 ffffea0000ca5008 0000000000000000
raw: ffff8880326d0400 0000000000000004 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9906, tgid 9901 (syz.1.1153), ts 121395095504, free_ts 124155845291
 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/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_node_track_caller_noprof+0x2f8/0x4e0
 krealloc_noprof+0x124/0x340
 copy_array+0x63/0xf0
 copy_verifier_state+0xaf/0xf10
 push_stack+0x19d/0x390
 check_cond_jmp_op+0x1469/0x2910
 do_check+0x6751/0xe520
 do_check_common+0x1949/0x24f0
 bpf_check+0x1746a/0x1d2d0
 bpf_prog_load+0x1318/0x1930
page last free pid 10119 tgid 10118 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 ref_tracker_alloc+0x133/0x460
 netdev_queue_update_kobjects+0x1d1/0x6c0
 netdev_register_kobject+0x258/0x310
 register_netdevice+0x126c/0x1ae0
 macvlan_common_newlink+0x120a/0x1980
 rtnl_newlink_create+0x310/0xb00
 rtnl_newlink+0x16d6/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0

Memory state around the buggy address:
 ffff8880326d0880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880326d0900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880326d0980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff8880326d0a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880326d0a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
