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

[bugzilla at busybox.net]

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

            Bug ID: 15476
           Summary: cd allows odd .... directory
           Product: Busybox
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: mstam at ripe.net
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9556
  --> https://bugs.busybox.net/attachment.cgi?id=9556&action=edit
busybox .config

Hi guys,

I mistyped a directory name by working on an OpenWRT box running an older
version of busybox executing 'cd .../..' instead of 'cd ../..'. The command
returns exit code 0, but doesn't seem to do anything.

I did some further investigation, executing 'cd
................................/..' and still this is allowed. 'cd ../...'
returns the expected "can't cd to" error, however 'cd ../........./..' again
executes (and goes only one directory up).

Any thoughts?

Built on a PC, but also observed on 2 different AARCH64 systems, each one
running older versions of OpenWRT (2018 and 2020 from memory). This suggests
this has been around for a while.

Config is mostly default, I ran:
git clone https://git.busybox.net/busybox.git
cd busybox
git checkout master
make defconfig
make menuconfig <<<<< disable seedrng, it cannot find sys/random.h
make
busybox ash
cd ....../.. <<<<<<< or any of the other mentioned commands.

Hope it helps.

Cheers,

Michel

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