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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x666/0xca0
Write of size 8 at addr ffff88802a7fe428 by task kworker/u8:1/13

CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 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
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __xfrm_state_delete+0x666/0xca0
 xfrm_state_flush+0x45f/0x770
 xfrm6_tunnel_net_exit+0x3c/0x100
 ops_undo_list+0x49a/0x990
 cleanup_net+0x4c5/0x800
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 13119:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 pfkey_add+0x6e4/0x2e00
 pfkey_sendmsg+0xbfe/0x1090
 __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 10:
 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+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88802a7fe400
 which belongs to the cache xfrm_state of size 928
The buggy address is located 40 bytes inside of
 freed 928-byte region [ffff88802a7fe400, ffff88802a7fe7a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802a7fdb00 pfn:0x2a7fc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801c7683c0 dead000000000122 0000000000000000
raw: ffff88802a7fdb00 00000000800e0007 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801c7683c0 dead000000000122 0000000000000000
head: ffff88802a7fdb00 00000000800e0007 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000a9ff01 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 6183, tgid 6182 (syz.2.75), ts 66548474906, free_ts 66417592410
 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/0x1420
 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+0x58a/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 ip6_sk_dst_lookup_flow+0x790/0x980
 udpv6_sendmsg+0x183b/0x24b0
 __sock_sendmsg+0xe5/0x270
 ____sys_sendmsg+0x52d/0x830
page last free pid 6176 tgid 6165 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_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 cfg80211_del_sta_sinfo+0x19c/0x5d0
 __sta_info_destroy_part2+0x342/0x450
 __sta_info_flush+0x5e4/0x710
 ieee80211_ibss_disconnect+0x2da/0x7c0
 ieee80211_ibss_leave+0x47/0x150
 cfg80211_leave_ibss+0x1e7/0x410
 cfg80211_netdev_notifier_call+0x1b3/0x1450
 notifier_call_chain+0x1b6/0x3e0
 __dev_close_many+0x106/0x6f0
 netif_close_many+0x225/0x410

Memory state around the buggy address:
 ffff88802a7fe300: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802a7fe380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802a7fe400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88802a7fe480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802a7fe500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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