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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff8880282cc030 by task syz.1.1237/10296

CPU: 1 UID: 0 PID: 10296 Comm: syz.1.1237 Not tainted 6.16.0-rc7-syzkaller-01630-g8b5a19b4ff6a-dirty #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/0x230
 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:bpf_test_timer_continue+0xd5/0x350
Code: 48 81 e5 00 00 02 00 0f 85 f6 01 00 00 4c 89 e7 be 08 00 00 00 e8 2b 8f 8b f8 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 <74> 08 4c 89 e7 e8 a1 8c 8b f8 49 8b 2c 24 48 89 ee 48 83 e6 04 31
RSP: 0018:ffffc900065cf978 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff92000cb9f51 RCX: ffffffff8996ab15
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881092a1cc0
RBP: 0000000000000000 R08: ffff8881092a1cc7 R09: 1ffff11021254398
R10: dffffc0000000000 R11: ffffed1021254399 R12: ffff8881092a1cc0
R13: 1ffff11021254398 R14: ffffc900065cfa88 R15: ffffc900065cfa8c
 bpf_test_run+0x39c/0x7b0
 bpf_prog_test_run_skb+0xb30/0x1560
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x4a4/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe4dd8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efe4bbf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007efe4dfb5fa0 RCX: 00007efe4dd8e9a9
RDX: 0000000000000050 RSI: 00002000000003c0 RDI: 000000000000000a
RBP: 00007efe4de10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efe4dfb5fa0 R15: 00007fffe8937358
 </TASK>

Allocated by task 7590:
 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 9:
 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 ffff8880282cc000
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff8880282cc000, ffff8880282cc3a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880282cc480 pfn:0x282cc
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 ffff88801afbc780 dead000000000122 0000000000000000
raw: ffff8880282cc480 00000000800e000c 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801afbc780 dead000000000122 0000000000000000
head: ffff8880282cc480 00000000800e000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000a0b301 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 6967, tgid 6966 (syz.0.296), ts 88319692593, free_ts 88316165092
 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_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
page last free pid 6967 tgid 6966 stack trace:
 __free_frozen_pages+0xc71/0xe70
 stack_depot_save_flags+0x445/0x900
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 crypto_larval_alloc+0x59/0x290
 crypto_alg_mod_lookup+0x1a4/0x5f0
 crypto_add_alg+0x235/0x3b0
 crypto_user_rcv_msg+0x47a/0x570
 netlink_rcv_skb+0x208/0x470
 crypto_netlink_rcv+0x2a/0x40
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0

Memory state around the buggy address:
 ffff8880282cbf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880282cbf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880282cc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8880282cc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880282cc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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