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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff888011e91230 by task syz.2.2061/13541

CPU: 1 UID: 0 PID: 13541 Comm: syz.2.2061 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:__se_sys_clock_nanosleep+0x129/0x380
Code: 5c 24 08 44 89 f0 83 e0 0f 48 83 f8 0c 48 19 db 44 21 f3 83 e3 0f 48 8d 3c dd a0 26 8d 8b 48 89 f8 48 c1 e8 03 42 80 3c 38 00 <74> 05 e8 40 2d 73 00 4c 8b 2c dd a0 26 8d 8b ba 10 00 00 00 48 8d
RSP: 0018:ffffc90006707e20 EFLAGS: 00000246
RAX: 1ffffffff171a4d4 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888029e18000 RSI: 0000000000000000 RDI: ffffffff8b8d26a0
RBP: ffffc90006707ee0 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: ffffc90006707e60
R13: 1ffff92000ce0fc8 R14: 0000000000000000 R15: dffffc0000000000
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf0f9c14a5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fff6a4e1740 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007fbf0fbc5fa0 RCX: 00007fbf0f9c14a5
RDX: 00007fff6a4e1780 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fbf0fbc7da0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000231e1
R13: 00007fbf0fbc6090 R14: ffffffffffffffff R15: 00007fff6a4e18c0
 </TASK>

Allocated by task 12552:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 xfrm_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 udp_sendmsg+0x142e/0x2170
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5871:
 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 ffff888011e91200
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff888011e91200, ffff888011e915a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888011e90d80 pfn:0x11e90
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801e214280 ffff88801c3dd708 ffffea0001249f10
raw: ffff888011e90d80 00000000000e0003 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801e214280 ffff88801c3dd708 ffffea0001249f10
head: ffff888011e90d80 00000000000e0003 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000047a401 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 6218, tgid 6215 (syz.2.74), ts 49720286467, free_ts 49706454625
 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
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 pfkey_getspi+0x65d/0xee0
 pfkey_sendmsg+0xbfe/0x1090
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
page last free pid 6212 tgid 6205 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 dst_alloc+0x105/0x170
 ip_route_input_rcu+0x1ed5/0x2ff0
 ip_route_input_noref+0x167/0x250
 ip_rcv_finish_core+0x5af/0x1c00
 ip_rcv_finish+0x14c/0x2f0
 NF_HOOK+0x30c/0x3a0
 __netif_receive_skb+0x143/0x380
 netif_receive_skb+0x1cb/0x790
 tun_rx_batched+0x1b9/0x730
 tun_get_user+0x2aa2/0x3e20
 tun_chr_write_iter+0x113/0x200

Memory state around the buggy address:
 ffff888011e91100: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888011e91180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888011e91200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888011e91280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011e91300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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