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

Use-after-free read at 0xffff8881365f8142 (in kfence-#251):
 __xfrm_state_lookup+0x319/0x8d0
 xfrm_state_add+0x27d/0xc40
 pfkey_add+0x1edd/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

kfence-#251: 0xffff8881365f8000-0xffff8881365f8fff, size=4096, cache=kmalloc-4k

allocated by task 8137 on cpu 1 at 200.150716s (4.665978s ago):
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

freed by task 8137 on cpu 1 at 200.150744s (4.680307s ago):
 tomoyo_realpath_from_path+0x598/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 8270 Comm: syz.7.615 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 78 b8 9e f7 66 45 39 ee 0f 85 2f
RSP: 0018:ffffc90007687480 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881365f8000 RCX: 1ffff1102271ed27
RDX: ffff888107b85640 RSI: 000000000000000a RDI: 000000000000000a
RBP: ffffc90007687578 R08: dffffc0000000000 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000002 R12: dffffc0000000000
R13: 000000000000000a R14: ffff8881365f8142 R15: 0000000000000000
FS:  00007f1f60b036c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881365f8142 CR3: 000000010c7c2000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 xfrm_state_add+0x27d/0xc40
 pfkey_add+0x1edd/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
RIP: 0033:0x7f1f5fb8eba9
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:00007f1f60b03038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1f5fdd5fa0 RCX: 00007f1f5fb8eba9
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000007
RBP: 00007f1f5fc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f5fdd6038 R14: 00007f1f5fdd5fa0 R15: 00007ffd2e76f368
 </TASK>
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