CVE Request: FreeBSD kernel, double-fetch bug in smb_strdupin

["Xu, Meng" <meng.xu () gatech edu>]

Hello,

In function  smb_strdupin()  of file sys/netsmb/smb_subr.c,
smb_strdupin() tried to roll a copyin() based strlen to allocate a buffer
and then blindly copyin that size.  Of course, a malicious user program
could simultaneously manipulate the buffer, resulting in a non-terminated
string being copied.

Bug report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222687
Patch: https://svnweb.freebsd.org/base?view=revision&revision=324102

Please help assign a CVE to it.

Thanks,
Meng