[Bug 15476] cd allows odd .... directory

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15476

--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com> ---
cd DIR

cdcmd() -> docd() -> updatepwd(), and updatepwd has the code which "normalizes"
the DIR: prepends current dir if DIR is not absolute, then eliminates
"SUBDIR/.." sections.

The bug is, it does not care whether SUBDIR exists:

cd BOGUSDIR/../existing_dir

works.

The same exact code is in dash. Needs to be fixed there first.

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