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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff888116290db0 by task syz.5.2282/15118

CPU: 0 UID: 0 PID: 15118 Comm: syz.5.2282 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:arch_check_zapped_pte+0x3a/0xb0
Code: ec 31 4b 00 49 83 c6 20 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 e9 9f ae 00 4d 8b 36 <49> bf 00 00 00 00 20 00 00 00 4c 89 fe 4c 21 f6 31 ff e8 8f 36 4b
RSP: 0018:ffffc900068873c0 EFLAGS: 00000246
RAX: 1ffff1100472b8c4 RBX: 800000010e2e6007 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 800000010e2e6007 RDI: ffff88802395c600
RBP: ffffc90006887690 R08: ffffea000438b987 R09: 1ffffd4000871730
R10: dffffc0000000000 R11: fffff94000871731 R12: dffffc0000000000
R13: 00007fddbc7ac000 R14: 00000000180400fb R15: 800000010e2e6007
 unmap_page_range+0x1e5d/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
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fddbd84f927
Code: Unable to access opcode bytes at 0x7fddbd84f8fd.
RSP: 002b:00007fddbe7e4460 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fddbd98ebe9
RDX: 00007fddbe7e4480 RSI: 00007fddbe7e45b0 RDI: 000000000000000b
RBP: 00007fddbda11e19 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fddbdbc6038 R14: 00007fddbdbc5fa0 R15: 00007ffe8227be18
 </TASK>

Allocated by task 14252:
 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 5910:
 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 ffff888116290d80
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff888116290d80, ffff888116291120)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888116290000 pfn:0x116290
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 ffff88801af14780 dead000000000122 0000000000000000
raw: ffff888116290000 00000000800e000d 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801af14780 dead000000000122 0000000000000000
head: ffff888116290000 00000000800e000d 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000458a401 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 6159, tgid 6158 (syz.3.48), ts 82628057158, free_ts 77849559473
 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 5296 tgid 5296 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
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 getname_flags+0xb8/0x540
 do_readlinkat+0xbc/0x500
 __x64_sys_readlink+0x7f/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888116290c80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888116290d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888116290d80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888116290e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888116290e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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