netlink: 392 bytes leftover after parsing attributes in process `syz.8.5232'.
==================================================================
BUG: KASAN: use-after-free in xfrm_alloc_spi+0x570/0xf30
Read of size 4 at addr ffff8881127fc9c4 by task syz.8.5232/10239

CPU: 1 UID: 0 PID: 10239 Comm: syz.8.5232 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:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 xfrm_alloc_spi+0x570/0xf30
 xfrm_alloc_userspi+0x70b/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
RIP: 0033:0x7f5ee2d8ec29
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:00007f5ee3bb2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5ee2fd5fa0 RCX: 00007f5ee2d8ec29
RDX: 0000000000000000 RSI: 0000200000000540 RDI: 0000000000000008
RBP: 00007f5ee2e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ee2fd6038 R14: 00007f5ee2fd5fa0 R15: 00007ffe301e2e28
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881127fd800 pfn:0x1127fc
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff8881127fd800 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x442dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_COMP), pid 7552, tgid 7551 (syz.0.5050), ts 937474121900, free_ts 937513877157
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 alloc_pages_noprof+0xa9/0x190
 io_region_allocate_pages+0xe9/0x4c0
 io_create_region+0x374/0x480
 io_allocate_scq_urings+0x4e9/0x7f0
 io_uring_create+0x52b/0xb60
 __se_sys_io_uring_setup+0x264/0x270
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7581 tgid 7581 stack trace:
 free_unref_folios+0xdbd/0x1520
 folios_put_refs+0x559/0x640
 release_pages+0x4b4/0x520
 io_free_region+0xb4/0x270
 io_ring_ctx_free+0x278/0x4e0
 io_ring_exit_work+0x8c4/0x930
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff8881127fc880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881127fc900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881127fc980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff8881127fca00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881127fca80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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