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BUG: KASAN: global-out-of-bounds in xfrm_alloc_spi+0x570/0xf30
Read of size 4 at addr ffffffff8f82d29c by task syz.1.4249/21882

CPU: 1 UID: 0 PID: 21882 Comm: syz.1.4249 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: 0033:0x7fc3d818ec29
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:00007fc3d63ee038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc3d83d5fa0 RCX: 00007fc3d818ec29
RDX: 0000000024000014 RSI: 0000200000000200 RDI: 0000000000000006
RBP: 00007fc3d8211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc3d83d6038 R14: 00007fc3d83d5fa0 R15: 00007ffd8e7dbb38
 </TASK>

The buggy address belongs to the variable:
 net_sysctl_root+0x9c/0xa0

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xf82d
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00003e0b48 ffffea00003e0b48 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8f82d180: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9
 ffffffff8f82d200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff8f82d280: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffffffff8f82d300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8f82d380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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