[Bug 1802149] [NEW] redir to an empty variable

[Pavel Boldin]

Public bug reported:

Redirection to an empty variable causes `dash` to exit abnormally via
SIGSEGV.


1) $ lsb_release -rd
Description:	Ubuntu 16.04.5 LTS
Release:	16.04
2) $ apt-cache policy dash
dash:
  Installed: 0.5.8-2.1ubuntu2
  Candidate: 0.5.8-2.1ubuntu2
  Version table:
 *** 0.5.8-2.1ubuntu2 500
        500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
3) Script to reproduce:
$ cat test.sh 

foobar() {
	local a=$1
	echo abc >&$a
}
foobar

4) Result:
$ dash ~/cloudlinux/kernelcare/test.sh 
Segmentation fault (core dumped)

** Affects: dash (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1802149

Title:
  redir to an empty variable

Status in dash package in Ubuntu:
  New

Bug description:
  Redirection to an empty variable causes `dash` to exit abnormally via
  SIGSEGV.

  
  1) $ lsb_release -rd
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04
  2) $ apt-cache policy dash
  dash:
    Installed: 0.5.8-2.1ubuntu2
    Candidate: 0.5.8-2.1ubuntu2
    Version table:
   *** 0.5.8-2.1ubuntu2 500
          500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  3) Script to reproduce:
  $ cat test.sh 

  foobar() {
  	local a=$1
  	echo abc >&$a
  }
  foobar

  4) Result:
  $ dash ~/cloudlinux/kernelcare/test.sh 
  Segmentation fault (core dumped)

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