Package: symlinks
Version: symlinks
Severity: normal
Tags: upstream

Dear Maintainer,

Expected behavior: symlinks handles paths such as /..

Actual behavior: symlinks crashes with SIGSEGV.

Steps to reproduce:

ln -s /.. mylink
symlinks .
Segmentation fault (core dumped)

Discussion: The parent directory of the root directory is just the root directory. However, symlinks does not handle this case properly, leading to a segmentation fault.

A minimal script to reproduce the crash is attached.

-- System Information:
Debian Release: 10.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages symlinks depends on:
ii  libc6  2.28-10

symlinks recommends no packages.

symlinks suggests no packages.

Attachment: reproduce.sh
Description: application/shellscript

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