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diff -up Linux-PAM-1.1.8/modules/pam_mkhomedir/mkhomedir_helper.c.mkhomedir-inroot Linux-PAM-1.1.8/modules/pam_mkhomedir/mkhomedir_helper.c
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--- Linux-PAM-1.1.8/modules/pam_mkhomedir/mkhomedir_helper.c.mkhomedir-inroot	2013-06-18 16:11:21.000000000 +0200
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+++ Linux-PAM-1.1.8/modules/pam_mkhomedir/mkhomedir_helper.c	2017-11-03 10:20:59.823998481 +0100
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@@ -352,16 +352,18 @@ make_parent_dirs(char *dir, int make)
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   char *cp = strrchr(dir, '/');
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   struct stat st;
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-  if (!cp || cp == dir)
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+  if (!cp)
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     return rc;
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-  *cp = '\0';
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-  if (stat(dir, &st) && errno == ENOENT)
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-    rc = make_parent_dirs(dir, 1);
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-  *cp = '/';
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+  if (cp != dir) {
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+    *cp = '\0';
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+    if (stat(dir, &st) && errno == ENOENT)
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+      rc = make_parent_dirs(dir, 1);
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+    *cp = '/';
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-  if (rc != PAM_SUCCESS)
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-    return rc;
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+    if (rc != PAM_SUCCESS)
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+      return rc;
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+  }
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   if (make && mkdir(dir, 0755) && errno != EEXIST) {
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     pam_syslog(NULL, LOG_ERR, "unable to create directory %s: %m", dir);