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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>