==================================================================
BUG: KASAN: slab-use-after-free in __xfrm_state_insert+0x101f/0x1450
Write of size 8 at addr ffff888022a10410 by task syz.2.2648/16381

CPU: 1 UID: 0 PID: 16381 Comm: syz.2.2648 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_state_insert+0x101f/0x1450
 xfrm_state_add+0x564/0xc40
 xfrm_add_sa+0x35a1/0x4070
 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: 0033:0x7fb1b458ebe9
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:00007fb1b5462038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb1b47c5fa0 RCX: 00007fb1b458ebe9
RDX: 0000000000000804 RSI: 0000200000000100 RDI: 000000000000000d
RBP: 00007fb1b4611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb1b47c6038 R14: 00007fb1b47c5fa0 R15: 00007fff6cf632e8
 </TASK>

Allocated by task 5841:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 xfrm_state_init+0x18e/0x5a0
 xfrm_net_init+0x206/0xef0
 ops_init+0x35c/0x5c0
 setup_net+0x10c/0x320
 copy_net_ns+0x31b/0x4d0
 create_new_namespaces+0x3f3/0x720
 unshare_nsproxy_namespaces+0x11c/0x170
 ksys_unshare+0x4c8/0x8c0
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 xfrm_hash_resize+0x15f7/0x1890
 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 ffff888022a10400
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 freed 64-byte region [ffff888022a10400, ffff888022a10440)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888022a10280 pfn:0x22a10
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801a4418c0 ffffea0000e776d0 ffffea00008d9a50
raw: ffff888022a10280 000000000020001f 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1090, tgid 1090 (kworker/u9:5), ts 13251355612, free_ts 13251348796
 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_noprof+0x2fd/0x4e0
 __vmalloc_node_range_noprof+0x5a9/0x12f0
 __vmalloc_node_noprof+0xc2/0x110
 dup_task_struct+0x3e7/0x860
 copy_process+0x54b/0x3c00
 kernel_clone+0x21e/0x840
 user_mode_thread+0xdd/0x140
 call_usermodehelper_exec_work+0x5c/0x230
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
page last free pid 1090 tgid 1090 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 kasan_populate_vmalloc+0x18a/0x1a0
 alloc_vmap_area+0xd51/0x1490
 __get_vm_area_node+0x1f8/0x300
 __vmalloc_node_range_noprof+0x301/0x12f0
 __vmalloc_node_noprof+0xc2/0x110
 dup_task_struct+0x3e7/0x860
 copy_process+0x54b/0x3c00
 kernel_clone+0x21e/0x840
 user_mode_thread+0xdd/0x140
 call_usermodehelper_exec_work+0x5c/0x230
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff888022a10300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888022a10380: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
>ffff888022a10400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                         ^
 ffff888022a10480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888022a10500: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
