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Bash crashes with segfault on certain script constructs

From: Karlheinz Nolte
Subject: Bash crashes with segfault on certain script constructs
Date: Sun, 1 Aug 2004 22:00:58 +0200
User-agent: Mutt/1.5.6+20040523i

  Configuration Information [Automatically generated, do not change]:
  Machine: i686
  OS: linux-gnu
  Compiler: gcc
  Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H  -I.  -I. -I./include -I./lib   -O3 -mtune=athlon-xp 
-mcpu=athlon-xp -mfpmath=sse -funroll-loops -fforce-addr -falign-functions=4 
-mpreferred-stack-boundary=2 -msse -m3dnow -mmmx
  uname output: Linux solfire 2.6.8-rc2-bk10 #1 Sun Aug 1 08:15:00 CEST 2004 
i686 AuthenticAMD unknown GNU/Linux
  Machine Type: i686-pc-linux-gnu
  Bash Version: 3.0
  Patch Level: 0
  Release Status: release
      Bash crashes on Execution of FireHOL 196, which is a shell script.
      No shell script should be able to crash a shell.
      The following script triggers the segfault.
      This was found by Costa Tsaousis the author of FireHOL.
          He wrotes:

          "I think I have found the bug. The script bellow crashes at the
       third echo (UNSET). It seems to be a problem of the "unset" BASH
       function when erasing arrays. It leaves something behind so that if
       the array just unset is referenced, it produces a segmentation fault.
       According to the documentation the first and the third expansions
       should be exactly the same."
      rule() {
                  echo "1. BEFORE SET:" "address@hidden"
                  local -a s=()
                  echo "2. SET TO EMPTY:" "address@hidden"
                  unset s
                  echo "3. UNSET:" "address@hidden"
      Also see Gentoo Bugzilla Bug 58961   

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