popd in bash might allow local users to bypass the restricted shell
and cause a use-after-free via a crafted address.
Porting patch from <https://ftp.gnu.org/pub/gnu/bash/bash-4.4-patches/
bash44-006> to solve CVE-2016-9401.
(From OE-Core rev: 6987b317d5ce8dc50a37ebba395aa8424bec358c)
Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>