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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff8880294a1fb0 by task syz-executor/5827

CPU: 1 UID: 0 PID: 5827 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-01993-ge3f96b3556e4 #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/0x230
 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:aa_file_perm+0xf1/0xed0
Code: 49 8d 9e 28 01 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 60 42 80 3c 38 00 74 08 48 89 df e8 c7 44 a4 fd 4c 89 74 24 30 4c 8b 23 <48> c7 c0 f4 63 bd 8d 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 be 0c
RSP: 0018:ffffc9000330fa60 EFLAGS: 00000246
RAX: 1ffff11021d362a5 RBX: ffff88810e9b1528 RCX: ffff88801fc98000
RDX: 0000000000000000 RSI: ffff888108f1d000 RDI: ffffffff8bdc99e0
RBP: ffffc9000330fbd8 R08: 0000000000000004 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1004006b81 R12: ffff888108ba2a00
R13: ffff88810000e100 R14: ffff88810e9b1400 R15: dffffc0000000000
 common_file_perm+0x18f/0x200
 security_file_permission+0x91/0x290
 rw_verify_area+0xba/0x650
 vfs_read+0x154/0x980
 ksys_read+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee0418d3bc
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 93 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 ef 93 02 00 48
RSP: 002b:00007fffa84e6fc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fee0418d3bc
RDX: 0000000000000030 RSI: 00007fffa84e7080 RDI: 00000000000000f9
RBP: 00007fffa84e702c R08: 0000000000000000 R09: 00007fffa84e6d37
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000004a9
R13: 00000000000927c0 R14: 000000000003402d R15: 00007fffa84e7080
 </TASK>

Allocated by task 13466:
 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 5880:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 xfrm_state_gc_task+0x518/0x6a0
 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 ffff8880294a1f80
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff8880294a1f80, ffff8880294a2320)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880294a0900 pfn:0x294a0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801bb85a00 dead000000000122 0000000000000000
raw: ffff8880294a0900 00000000800e0005 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801bb85a00 dead000000000122 0000000000000000
head: ffff8880294a0900 00000000800e0005 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000a52801 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 9742, tgid 9741 (syz.1.1220), ts 112629669163, free_ts 112602946509
 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_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 9730 tgid 9730 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:
 ffff8880294a1e80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880294a1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880294a1f80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8880294a2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880294a2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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