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BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff888037e96bb0 by task modprobe/13338

CPU: 0 UID: 0 PID: 13338 Comm: modprobe Not tainted 6.16.0-syzkaller-06620-gae633388cae3 #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
 tipc_udp_xmit+0x1c3/0xaa0
 tipc_udp_send_msg+0x27f/0x3f0
 tipc_bearer_xmit_skb+0x2b3/0x400
 tipc_disc_timeout+0x580/0x6d0
 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:do_raw_spin_lock+0x121/0x290
Code: 0f 84 f3 00 00 00 c7 44 24 40 00 00 00 00 48 89 df be 04 00 00 00 e8 ee c0 84 00 48 8d 7c 24 40 be 04 00 00 00 e8 df c0 84 00 <8b> 44 24 40 b9 01 00 00 00 f0 0f b1 0b 0f 85 dd 00 00 00 65 8b 1d
RSP: 0018:ffffc90007e97040 EFLAGS: 00000297
RAX: 00000000ffffff01 RBX: ffff88801bf686c0 RCX: ffffffff819e1561
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90007e97080
RBP: ffffc90007e970f8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000fd2e10 R12: ffff88801bf686d0
R13: ffff88801bf686c8 R14: 1ffff110037ed0da R15: 1ffff110037ed0d9
 __pte_offset_map_lock+0x13e/0x210
 unmap_page_range+0xc06/0x41c0
 unmap_vmas+0x399/0x580
 vms_clear_ptes+0x35c/0x540
 mmap_region+0x8b4/0x1f30
 do_mmap+0xc45/0x10d0
 vm_mmap_pgoff+0x31b/0x4c0
 ksys_mmap_pgoff+0x51f/0x760
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4bb95c5b74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007ffed23e3398 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffed23e3410 RCX: 00007f4bb95c5b74
RDX: 0000000000000001 RSI: 0000000000053000 RDI: 00007f4bb9477000
RBP: 00007ffed23e3b30 R08: 0000000000000000 R09: 000000000014b000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007f4bb95a0500
R13: 00007ffed23e3bb8 R14: 000000000014ab8e R15: 0000000000000000
 </TASK>

Allocated by task 10947:
 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 24:
 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 ffff888037e96880
 which belongs to the cache xfrm_state of size 928
The buggy address is located 816 bytes inside of
 freed 928-byte region [ffff888037e96880, ffff888037e96c20)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888037e96880 pfn:0x37e94
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801af71780 ffffea0000a14600 dead000000000003
raw: ffff888037e96880 00000000800e0007 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801af71780 ffffea0000a14600 dead000000000003
head: ffff888037e96880 00000000800e0007 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000dfa501 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 6249, tgid 6244 (syz.1.104), ts 52299801657, free_ts 51833902504
 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_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
page last free pid 5818 tgid 5818 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __put_partials+0x161/0x1c0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2f7/0x400
 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
 user_path_at+0x24/0x60
 __x64_sys_umount+0xee/0x160
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888037e96a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888037e96b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888037e96b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888037e96c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888037e96c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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