[syzbot] memory leak in ip_vs_add_service

To: coreteam@xxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, fw@xxxxxxxxx, horms@xxxxxxxxxxxx, ja@xxxxxx, kadlec@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, pablo@xxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx
Subject: [syzbot] memory leak in ip_vs_add_service
From: syzbot <syzbot+e562383183e4b1766930@xxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 24 May 2021 07:33:24 -0700

syzbot found the following issue on:

HEAD commit:    c3d0e3fd Merge tag 'fs.idmapped.mount_setattr.v5.13-rc3' o..
git tree:       upstream
console output:
kernel config:
dashboard link:
syz repro:
C reproducer:

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e562383183e4b1766930@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: memory leak
unreferenced object 0xffff888115227800 (size 512):
  comm "syz-executor263", pid 8658, jiffies 4294951882 (age 12.560s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    [<ffffffff83977188>] kmalloc include/linux/slab.h:556 [inline]
    [<ffffffff83977188>] kzalloc include/linux/slab.h:686 [inline]
    [<ffffffff83977188>] ip_vs_add_service+0x598/0x7c0 
    [<ffffffff8397d770>] do_ip_vs_set_ctl+0x810/0xa40 
    [<ffffffff838449a8>] nf_setsockopt+0x68/0xa0 net/netfilter/nf_sockopt.c:101
    [<ffffffff839ae4e9>] ip_setsockopt+0x259/0x1ff0 net/ipv4/ip_sockglue.c:1435
    [<ffffffff839fa03c>] raw_setsockopt+0x18c/0x1b0 net/ipv4/raw.c:857
    [<ffffffff83691f20>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2117
    [<ffffffff836920f2>] __do_sys_setsockopt net/socket.c:2128 [inline]
    [<ffffffff836920f2>] __se_sys_setsockopt net/socket.c:2125 [inline]
    [<ffffffff836920f2>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2125
    [<ffffffff84350efa>] do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

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