Merge r309638 from head:

Merge r309638 from head:

  When telnetd(8) composes argument list for login(1), an unexpected sequence
  of memory allocation failures combined with insufficient error checking
  could result in the construction and execution of an argument sequence that
  was not intended.

  Fix that treating malloc(3) failures as fatal condition.

Submitted by:	brooks
Security:	FreeBSD-SA-16:36.telnetd

git-svn-id: svn://svn.freebsd.org/base/stable/9@309643 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f