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If a user is logged in via LDAP, some implementations of getpwuid() seem to return NULL. Dereferencing this pointer will cause a segfault. This change avoids dereferencing the potential NULL pointer.
rumpeltux
commented
Mar 31, 2022
Thanks for the patch! LGTM, I hope the owners can soon merge this.
This can also happen if the apparmor profile that comes with debian is enabled which doesn’t grant read access to /etc/passwd*.
rumpeltux
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Apr 18, 2022
Related bugs: * https://bugzilla.suse.com/show_bug.cgi?id=1111906 * https://bugs.debian.org/988068 * sharpbracket#672 * sharpbracket#860 src/config-ini.c still looks for $HOME/.config/redshift.conf which fails to open because the apparmor profile doesn’t allow it. src/config-ini.c also does this: struct passwd *pwd = getpwuid(getuid()); char *home = pwd->pw_dir; Since getpwuid doesn’t have access to /etc/passwd* it returns NULL, causing a segmentation fault in the line thereafter. This code is not triggered if a config is specified (e.g. -c redshift.conf) or $HOME/.config/redshift.conf exists.
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If a user is logged in via LDAP, some implementations of getpwuid() seem
to return NULL. Dereferencing this pointer will cause a segfault. This
change avoids dereferencing the potential NULL pointer.