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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff888111b6bab0 by task syz.2.2256/14219

CPU: 1 UID: 0 PID: 14219 Comm: syz.2.2256 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:kasan_check_range+0x4/0x2c0
Code: 7a ba 8d e8 3e 00 05 ff 90 0f 0b cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 <55> 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ba 01 00 00 4c
RSP: 0018:ffffc900091a7630 EFLAGS: 00000282
RAX: 2f8851e6b8095800 RBX: ffff888012784c14 RCX: ffffffff823b16ed
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888012784c14
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10024f0960 R12: 1ffff1102001d405
R13: ffff8881000ea028 R14: ffff888012784a10 R15: dffffc0000000000
 inode_init_always_gfp+0x66d/0xdc0
 alloc_inode+0x82/0x1b0
 path_from_stashed+0x200/0x5c0
 proc_ns_get_link+0xec/0x210
 pick_link+0x636/0xe80
 step_into+0xc5d/0xf30
 path_openat+0x1bc6/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7ce2d8d550
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44
RSP: 002b:00007f7ce3c28f60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7ce2d8d550
RDX: 0000000000000000 RSI: 00007f7ce2e11f06 RDI: 00000000ffffff9c
RBP: 00007f7ce2e11f06 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f7ce2fb6128 R14: 00007f7ce2fb6090 R15: 00007ffe0d0075d8
 </TASK>

Allocated by task 10985:
 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 5314:
 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 ffff888111b6ba80
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff888111b6ba80, ffff888111b6be20)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888111b6ba80 pfn:0x111b68
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88801af0a780 ffffea000486c110 ffff88810502c288
raw: ffff888111b6ba80 00000000000e0004 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff88801af0a780 ffffea000486c110 ffff88810502c288
head: ffff888111b6ba80 00000000000e0004 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000446da01 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 5968, tgid 5967 (syz.0.15), ts 47595182312, free_ts 47595146526
 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_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 __ip4_datagram_connect+0x9a5/0x1270
 __ip6_datagram_connect+0x9f0/0x1150
 ip6_datagram_connect_v6_only+0x63/0xa0
 __sys_connect+0x316/0x440
page last free pid 5968 tgid 5967 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_output_key_hash_rcu+0x14e1/0x23d0
 ip_route_output_key_hash+0x1b9/0x2e0
 __ip4_datagram_connect+0x8f4/0x1270
 __ip6_datagram_connect+0x9f0/0x1150
 ip6_datagram_connect_v6_only+0x63/0xa0
 __sys_connect+0x316/0x440
 __x64_sys_connect+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888111b6b980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888111b6ba00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888111b6ba80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888111b6bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888111b6bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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