Index: contrib/smbfs/lib/smb/rcfile.c
===================================================================
--- contrib/smbfs/lib/smb/rcfile.c
+++ contrib/smbfs/lib/smb/rcfile.c
@@ -156,11 +156,19 @@
 rc_addsect(struct rcfile *rcp, const char *sectname)
 {
        struct rcsection *p;
+       char isup = 1;
+       const char* sectletter = sectname;
 
        p = rc_findsect(rcp, sectname);
        if (p) return p;
        p = malloc(sizeof(*p));
        if (!p) return NULL;
+       while(*sectletter) {
+               isup &= (isupper(*sectletter) || *sectletter == ':');
+               sectletter++;
+    }
+       if (!isup && strcmp(sectname, "default"))
+               dprintf(STDERR_FILENO, "warning: section name [%s] contains lower-case letters\n", sectname);
        p->rs_name = strdup(sectname);
        SLIST_INIT(&p->rs_keys);
        SLIST_INSERT_HEAD(&rcp->rf_sect, p, rs_next);