This squashes 2 consecutive upstream gnulib commits to fix gnulib seg.faults if there is no session: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65617 Upstream gnulib commit 3af1d7b0ce3a8e3ae565e7cea10cee6fd7cb8109 2023-08-31 Bruno Haible readutmp: Fix memory leak introduced by last commit. * lib/readutmp.c (read_utmp_from_systemd): If num_sessions == 0 and sessions != NULL, do call free (sessions). Upstream gnulib commit 1e6a26f9312bb47e070f94b17b14dc1a6ffbb74f 2023-08-30 Paul Eggert readutmp: fix core dump if --enable-systemd Problem reported by Thorsten Kukuk . * lib/readutmp.c (read_utmp_from_systemd): Don’t assume session_ptr != NULL if num_sessions == 0. In practice it can be null, and the man page OKs this behavior. --- lib/readutmp.c | 2 +- 1 files changed, 1 insertions(+), 1 deletion(-) diff --git a/lib/readutmp.c b/lib/readutmp.c index 0173b7e0c1..e99158677c 100644 --- a/lib/readutmp.c +++ b/lib/readutmp.c @@ -795,7 +795,7 @@ read_utmp_from_systemd (idx_t *n_entries, STRUCT_UTMP **utmp_buf, int options) { char **sessions; int num_sessions = sd_get_sessions (&sessions); - if (num_sessions >= 0) + if (num_sessions >= 0 && sessions != NULL) { char **session_ptr; for (session_ptr = sessions; *session_ptr != NULL; session_ptr++) -- 2.42.0