diff --git a/netutils/ftpc/ftpc_login.c b/netutils/ftpc/ftpc_login.c
index 8f21309af..6f9f53472 100644
--- a/netutils/ftpc/ftpc_login.c
+++ b/netutils/ftpc/ftpc_login.c
@@ -187,7 +187,10 @@ int ftpc_relogin(FAR struct ftpc_session_s *session)
 
   FTPC_SET_LOGGEDIN(session);
   session->homerdir = ftpc_rpwd((SESSION)session);
-  session->currdir  = strdup(session->homerdir);
+  if (session->homerdir != NULL)
+    {
+      session->currdir = strdup(session->homerdir);
+    }
 
   /* If the user has requested a special start up directory, then change to
    * that directory now.
diff --git a/netutils/ftpc/ftpc_mkdir.c b/netutils/ftpc/ftpc_mkdir.c
index 27981b48f..bd32121c3 100644
--- a/netutils/ftpc/ftpc_mkdir.c
+++ b/netutils/ftpc/ftpc_mkdir.c
@@ -85,6 +85,11 @@ int ftpc_mkdir(SESSION handle, FAR const char *path)
   int ret;
 
   ptr = strdup(path);
+  if (!ptr)
+    {
+      return ERROR;
+    }
+
   ftpc_stripslash(ptr);
 
   /* Send the MKD request. The MKD request asks the server to create a new
diff --git a/netutils/ftpc/ftpc_rename.c b/netutils/ftpc/ftpc_rename.c
index ec8aae8b7..c5d735a7a 100644
--- a/netutils/ftpc/ftpc_rename.c
+++ b/netutils/ftpc/ftpc_rename.c
@@ -86,6 +86,11 @@ int ftpc_rename(SESSION handle, FAR const char *oldname, FAR const char *newname
   int ret;
 
   oldcopy = strdup(oldname);
+  if (!oldcopy)
+    {
+      return ERROR;
+    }
+
   ftpc_stripslash(oldcopy);
 
   /* A RNFR request asks the server to begin renaming a file. A typical
@@ -107,7 +112,13 @@ int ftpc_rename(SESSION handle, FAR const char *oldname, FAR const char *newname
       return ERROR;
     }
 
+  free(oldcopy);
   newcopy = strdup(newname);
+  if (!newcopy)
+    {
+      return ERROR;
+    }
+
   ftpc_stripslash(newcopy);
 
   /* A RNTO request asks the server to finish renaming a file. RNTO must
@@ -128,7 +139,6 @@ int ftpc_rename(SESSION handle, FAR const char *oldname, FAR const char *newname
 
   ret = ftpc_cmd(session, "RNTO %s", newcopy);
 
-  free(oldcopy);
   free(newcopy);
   return ret;
 }
diff --git a/netutils/ftpc/ftpc_rmdir.c b/netutils/ftpc/ftpc_rmdir.c
index 4cf5cdf5b..5f78ef2b3 100644
--- a/netutils/ftpc/ftpc_rmdir.c
+++ b/netutils/ftpc/ftpc_rmdir.c
@@ -83,6 +83,11 @@ int ftpc_rmdir(SESSION handle, FAR const char *path)
   int ret;
 
   ptr = strdup(path);
+  if (!ptr)
+    {
+      return ERROR;
+    }
+
   ftpc_stripslash(ptr);
 
   /* An RMD request asks the server to remove a directory. A typical server
diff --git a/netutils/ftpc/ftpc_transfer.c b/netutils/ftpc/ftpc_transfer.c
index 72cbace11..b983a13fb 100644
--- a/netutils/ftpc/ftpc_transfer.c
+++ b/netutils/ftpc/ftpc_transfer.c
@@ -557,7 +557,11 @@ int ftpc_xfrmode(struct ftpc_session_s *session, uint8_t xfrmode)
 
       ret = ftpc_cmd(session, "TYPE %c",
                      xfrmode == FTPC_XFRMODE_ASCII ? 'A' : 'I');
-      UNUSED(ret);
+      if (ret < 0)
+        {
+          return ERROR;
+        }
+
       session->xfrmode = xfrmode;
     }