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BUG: KASAN: use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff88802829c7b0 by task syz.1.4560/16981

CPU: 0 UID: 0 PID: 16981 Comm: syz.1.4560 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-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:
 <TASK>
 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+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 udp_sendmsg+0x142e/0x2170
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22a438ebe9
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:00007f22a518e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f22a45b6090 RCX: 00007f22a438ebe9
RDX: 000000000800001d RSI: 0000200000007fc0 RDI: 0000000000000005
RBP: 00007f22a4411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f22a45b6128 R14: 00007f22a45b6090 R15: 00007ffda7820258
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802829fc00 pfn:0x2829c
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88802829fc00 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 16197, tgid 16196 (syz.6.4239), ts 391700691414, free_ts 391752661753
 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+0xe3/0x4b0
 io_create_region+0x374/0x480
 io_allocate_scq_urings+0x235/0x7f0
 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 16223 tgid 16223 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+0x287/0x4e0
 io_ring_exit_work+0x8c4/0x930
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff88802829c680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802829c700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802829c780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff88802829c800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802829c880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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