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BUG: KFENCE: use-after-free read in __xfrm_state_lookup+0x319/0x8d0

Use-after-free read at 0xffff888136416142 (in kfence-#10):
 __xfrm_state_lookup+0x319/0x8d0
 xfrm_state_lookup+0x11e/0x1e0
 ipcomp4_init_state+0x205/0xb20
 __xfrm_init_state+0xa76/0x13f0
 xfrm_add_sa+0x2f5b/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

kfence-#10: 0xffff888136416f00-0xffff888136416fef, size=240, cache=skbuff_head_cache

allocated by task 23 on cpu 1 at 262.496141s (12.331556s ago):
 __alloc_skb+0x112/0x2d0
 __tcp_send_ack+0xaf/0x620
 tcp_rcv_established+0x1065/0x1eb0
 tcp_v4_do_rcv+0xa23/0xce0
 tcp_v4_rcv+0x268e/0x2f10
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 NF_HOOK+0x30c/0x3a0
 __netif_receive_skb+0x143/0x380
 process_backlog+0x60e/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_call_function_single+0xa3/0xc0
 asm_sysvec_call_function_single+0x1a/0x20
 finish_task_switch+0x26b/0x950
 __schedule+0x17a0/0x4cc0
 schedule+0x165/0x360
 smpboot_thread_fn+0x5bd/0xa60
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

freed by task 23 on cpu 1 at 262.496208s (12.382764s ago):
 tcp_rcv_established+0xe9e/0x1eb0
 tcp_v4_do_rcv+0xa23/0xce0
 tcp_v4_rcv+0x268e/0x2f10
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 NF_HOOK+0x30c/0x3a0
 __netif_receive_skb+0x143/0x380
 process_backlog+0x60e/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_call_function_single+0xa3/0xc0
 asm_sysvec_call_function_single+0x1a/0x20
 finish_task_switch+0x26b/0x950
 __schedule+0x17a0/0x4cc0
 schedule+0x165/0x360
 smpboot_thread_fn+0x5bd/0xa60
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

CPU: 0 UID: 0 PID: 20806 Comm: syz.0.3600 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
RIP: 0010:__xfrm_state_lookup+0x319/0x8d0
Code: 30 48 89 4c 24 38 48 c1 e9 03 48 89 4c 24 50 4c 8d b3 42 01 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 7c 03 00 00 <45> 0f b7 36 44 89 f7 44 89 ee e8 08 f0 9e f7 66 45 39 ee 0f 85 2f
RSP: 0018:ffffc900062cf020 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888136416000 RCX: 1ffff11004151647
RDX: ffff888110081cc0 RSI: 0000000000000002 RDI: 000000000000000a
RBP: ffffc900062cf118 R08: ffff888110081cc0 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000002 R14: ffff888136416142 R15: 000000000100007f
FS:  00007f10f093e6c0(0000) GS:ffff8880b861a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888136416142 CR3: 000000012c5d8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xfrm_state_lookup+0x11e/0x1e0
 ipcomp4_init_state+0x205/0xb20
 __xfrm_init_state+0xa76/0x13f0
 xfrm_add_sa+0x2f5b/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
RIP: 0033:0x7f10efb8ebe9
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:00007f10f093e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f10efdc6090 RCX: 00007f10efb8ebe9
RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000007
RBP: 00007f10efc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f10efdc6128 R14: 00007f10efdc6090 R15: 00007fff8d0eb388
 </TASK>
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