netlink: 224 bytes leftover after parsing attributes in process `syz-executor.0'.
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BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:411 [inline]
BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x1f1c/0x2f70 lib/nlattr.c:635
Read of size 1 at addr ffffffff8c55d030 by task syz-executor.0/13439

CPU: 0 PID: 13439 Comm: syz-executor.0 Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 validate_nla lib/nlattr.c:411 [inline]
 __nla_validate_parse+0x1f1c/0x2f70 lib/nlattr.c:635
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:760 [inline]
 genl_family_rcv_msg_attrs_parse+0x1d1/0x290 net/netlink/genetlink.c:945
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1093 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x802/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2559
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7fcb7387de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb733ff0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fcb739abf80 RCX: 00007fcb7387de69
RDX: 0000000000000000 RSI: 0000000020001180 RDI: 0000000000000004
RBP: 00007fcb738ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fcb739abf80 R15: 00007ffe67457ca8
 </TASK>

The buggy address belongs to the variable:
 team_nl_policy+0x30/0x60

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc55d
flags: 0xfff80000002000(reserved|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000002000 ffffea0000315748 ffffea0000315748 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:
 ffffffff8c55cf00: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8c55cf80: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 f9 f9 f9 f9
>ffffffff8c55d000: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00
                                     ^
 ffffffff8c55d080: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 00 00 00
 ffffffff8c55d100: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 00 02 f9 f9
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