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pid1: fix segv triggered by status query (#26279)

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If any query makes it to the end of install_info_follow() then I think symlink_target is set to NULL.
If that is followed by -EXDEV from unit_file_load_or_readlink(), then that causes basename(NULL)
which segfaults pid 1.

This is triggered by eg. "systemctl status crond" in RHEL9 if

/etc/systemd/system/crond.service
  -> /ram/etc/systemd/system/crond.service
  -> /usr/lib/systemd/system/.crond.service.blah.blah
  -> /usr/lib/systemd/system/crond.service

(cherry picked from commit 19cfda9fc3)
This commit is contained in:
Robin Humble 2023-02-01 23:36:48 +11:00 committed by Luca Boccassi
parent 7573078a7d
commit 015b0ca928
1 changed files with 1 additions and 1 deletions
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2
src/shared/install.c
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@ -1658,7 +1658,7 @@ static int install_info_traverse(
r = install_info_follow(ctx, i, lp, flags,
/* If linked, don't look at the target name */
/* ignore_different_name= */ i->install_mode == INSTALL_MODE_LINKED);
if (r == -EXDEV) {
if (r == -EXDEV && i->symlink_target) {
_cleanup_free_ char *buffer = NULL;
const char *bn;