1 files changed, 12 insertions, 1 deletions

diff --git a/readconf.c b/readconf.c
index dc884c9b1..a4ecf7a0b 100644
--- a/readconf.c
+++ b/readconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.c,v 1.218 2014/02/23 20:11:36 djm Exp $ */
+/* $OpenBSD: readconf.c,v 1.219 2014/04/23 12:42:34 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -345,6 +345,7 @@ add_identity_file(Options *options, const char *dir, const char *filename,
     int userprovided)
 {
         char *path;
+        int i;
 
         if (options->num_identity_files >= SSH_MAX_IDENTITY_FILES)
                 fatal("Too many identity files specified (max %d)",
@@ -355,6 +356,16 @@ add_identity_file(Options *options, const char *dir, const char *filename,
         else
                 (void)xasprintf(&path, "%.100s%.100s", dir, filename);
 
+        /* Avoid registering duplicates */
+        for (i = 0; i < options->num_identity_files; i++) {
+                if (options->identity_file_userprovided[i] == userprovided &&
+                    strcmp(options->identity_files[i], path) == 0) {
+                        debug2("%s: ignoring duplicate key %s", __func__, path);
+                        free(path);
+                        return;
+                }
+        }
+
         options->identity_file_userprovided[options->num_identity_files] =
             userprovided;
         options->identity_files[options->num_identity_files++] = path;