Index: modules/mod_ls.c
===================================================================
RCS file: /cvsroot/proftp/proftpd/modules/mod_ls.c,v
retrieving revision 1.190
diff -u -r1.190 mod_ls.c
--- modules/mod_ls.c	19 Nov 2011 02:40:12 -0000	1.190
+++ modules/mod_ls.c	21 Nov 2011 21:56:05 -0000
@@ -460,6 +460,11 @@
 
         m[len] = '\0';
 
+        /* If the symlink points to either '.' or '..', skip it (Bug#3719). */
+        if (is_dotdir(m)) {
+          return 0;
+        }
+
         if (!ls_perms_full(p, cmd, m, NULL)) {
           return 0;
         }
@@ -478,6 +483,11 @@
 
       l[len] = '\0';
 
+      /* If the symlink points to either '.' or '..', skip it (Bug#3719). */
+      if (is_dotdir(l)) {
+        return 0;
+      }
+
       if (!ls_perms_full(p, cmd, l, &hidden)) {
         return 0;
       }