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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff888111771b30 by task syz.1.1742/12889

CPU: 0 UID: 0 PID: 12889 Comm: syz.1.1742 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:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __xfrm_state_delete+0x696/0xca0
 xfrm_timer_handler+0x18f/0xa00
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x55/0xb0
Code: fd bd 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 3c bc 7c 00 48 c7 c3 98 af a1 92 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 99 22 fa 10 74 11 83 e0
RSP: 0018:ffffc90022b87330 EFLAGS: 00000a06
RAX: 1ffff110096065f3 RBX: ffff88804b032f98 RCX: 3ff7841f21b5a800
RDX: ffff88811f9d8000 RSI: ffffffff8be337e0 RDI: ffffffff8be337a0
RBP: ffff88801c1c0430 R08: ffff88801c1c042f R09: 1ffff11003838085
R10: dffffc0000000000 R11: ffffed1003838086 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff8dbdfd10 R15: dffffc0000000000
 page_table_check_clear+0x483/0x700
 unmap_page_range+0x3445/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30d7d8ebe9
Code: Unable to access opcode bytes at 0x7f30d7d8ebbf.
RSP: 002b:00007f30d5fee0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f30d7fc5fa8 RCX: 00007f30d7d8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f30d7fc5fa8
RBP: 00007f30d7fc5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f30d7fc6038 R14: 00007ffd98a69c90 R15: 00007ffd98a69d78
 </TASK>

Allocated by task 10759:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 xfrm_alloc_userspi+0x6b3/0xc90
 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

Freed by task 5900:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 xfrm_state_gc_task+0x52d/0x6b0
 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 ffff888111771b00
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff888111771b00, ffff888111771ea0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888111771f80 pfn:0x111770
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 ffff888104a523c0 dead000000000122 0000000000000000
raw: ffff888111771f80 00000000800e0004 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff888104a523c0 dead000000000122 0000000000000000
head: ffff888111771f80 00000000800e0004 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000445dc01 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6124, tgid 6123 (syz.2.64), ts 62458479718, free_ts 61929401042
 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
 kmem_cache_alloc_noprof+0x283/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 xfrm_add_sa+0x17d1/0x4070
 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
page last free pid 6084 tgid 6084 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 ref_tracker_free+0xfe/0x7d0
 __sk_destruct+0x3c3/0x660
 __mptcp_close_ssk+0x768/0xfd0
 mptcp_destroy_common+0x152/0x320
 mptcp_destroy+0x84/0x120
 __mptcp_destroy_sock+0x156/0x350
 __mptcp_close+0x76a/0xb00
 mptcp_close+0x28/0x1a0
 inet_release+0x144/0x190
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0

Memory state around the buggy address:
 ffff888111771a00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888111771a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888111771b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888111771b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888111771c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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