Memory leak in brace expansion

[Sonny Sasaka]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2 -Wall
uname output: Linux sasaka.net 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 
2010 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.1
Patch Level: 5
Release Status: release

Description:
  It seems that there is memory leak in brace expansion. The memory used by 
bash interpreter gets larger and larger when running this script:

  #!/bin/bash
  foo=bar.txt
  while true
  do
    echo ${foo##*.}
  done

  However, the program works fine should the brace expansion be changed to 
${foo}. So, the cause of the leak must be at the ${foo##*.}

Repeat-By:
  Run this script:

  #!/bin/bash
  foo=bar.txt
  while true
  do
    echo ${foo##*.}
  done