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BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff88810ef9f930 by task syz.3.5772/28253

CPU: 1 UID: 0 PID: 28253 Comm: syz.3.5772 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_find+0x2cf2/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x58a/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 igmpv3_newpack+0x27d/0x11d0
 add_grhead+0x70/0x340
 add_grec+0x1122/0x13e0
 igmp_ifc_timer_expire+0x978/0xde0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 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:__tlb_remove_folio_pages_size+0x212/0x5a0
Code: eb 14 00 4d 89 26 49 8d 7c 24 08 48 89 f8 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 7b 02 00 00 41 8b 6c 24 08 49 83 c4 0c 4c 89 e0 <48> c1 e8 03 0f b6 04 18 84 c0 0f 85 79 02 00 00 45 8b 34 24 41 ff
RSP: 0018:ffffc9000258f348 EFLAGS: 00000286
RAX: ffff88811ec8200c RBX: dffffc0000000000 RCX: ffff88803ff2b980
RDX: 0000000000000000 RSI: 00000000000001fd RDI: ffff88811ec82008
RBP: 00000000000000ab R08: ffffea0000824c73 R09: 1ffffd400010498e
R10: dffffc0000000000 R11: fffff9400010498f R12: ffff88811ec8200c
R13: 00000000000001fd R14: 1ffff920004b1f11 R15: ffffc9000258f860
 unmap_page_range+0x20ac/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: 0033:0x7f9ad798ebe9
Code: Unable to access opcode bytes at 0x7f9ad798ebbf.
RSP: 002b:00007f9ad885e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9ad7bb5fa8 RCX: 00007f9ad798ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9ad7bb5fac
RBP: 00007f9ad7bb5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ad7bb6038 R14: 00007fffb2c3bed0 R15: 00007fffb2c3bfb8
 </TASK>

Allocated by task 25920:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 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
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5953:
 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 ffff88810ef9f600
 which belongs to the cache xfrm_state of size 928
The buggy address is located 816 bytes inside of
 freed 928-byte region [ffff88810ef9f600, ffff88810ef9f9a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810ef9fa80 pfn:0x10ef9c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88810068c640 0000000000000000 0000000000000001
raw: ffff88810ef9fa80 00000000000e0004 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88810068c640 0000000000000000 0000000000000001
head: ffff88810ef9fa80 00000000000e0004 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00043be701 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 6555, tgid 6554 (syz.0.143), ts 65765854236, free_ts 65702793501
 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_acquire+0xf7/0xb20
 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 6550 tgid 6549 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kvmalloc_node_noprof+0x30d/0x5f0
 nf_hook_entries_grow+0x27c/0x710
 __nf_register_net_hook+0x2c9/0x930
 nf_register_net_hook+0xb2/0x190
 nf_register_net_hooks+0x44/0x1b0
 nf_ct_netns_do_get+0x212/0x5a0
 nf_ct_netns_inet_get+0x3b/0x150
 nf_ct_netns_get+0x5b/0xb0
 nft_connlimit_do_init+0x1de/0x2e0
 nft_set_elem_expr_alloc+0x1db/0x590
 nft_set_expr_alloc+0x68/0x760
 nf_tables_newset+0x1c47/0x2530

Memory state around the buggy address:
 ffff88810ef9f800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810ef9f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810ef9f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88810ef9f980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810ef9fa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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