1 files changed, 4 insertions, 0 deletions
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index 1765f31a3a..40a669725e 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -24,6 +24,7 @@
 #include <grp.h>
 #include <shadow.h>
 #include <getopt.h>
+#include <utmp.h>
 
 #include "util.h"
 #include "hashmap.h"
@@ -1095,6 +1096,9 @@ static bool valid_user_group_name(const char *u) {
         if ((size_t) (i-u) > (size_t) sz)
                 return false;
 
+        if ((size_t) (i-u) > UT_NAMESIZE - 1)
+                return false;
+
         return true;
 }