1 files changed, 15 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/error_string.c b/source4/heimdal/lib/krb5/error_string.c
index 7a7b989b69..bebd4c490e 100644
--- a/source4/heimdal/lib/krb5/error_string.c
+++ b/source4/heimdal/lib/krb5/error_string.c
@@ -59,6 +59,8 @@ krb5_clear_error_message(krb5_context context)
  * Set the context full error string for a specific error code.
  * The error that is stored should be internationalized.
  *
+ * The if context is NULL, no error string is stored.
+ *
  * @param context Kerberos 5 context
  * @param ret The error code
  * @param fmt Error string for the error code
@@ -82,6 +84,8 @@ krb5_set_error_message(krb5_context context, krb5_error_code ret,
 /**
  * Set the context full error string for a specific error code.
  *
+ * The if context is NULL, no error string is stored.
+ *
  * @param context Kerberos 5 context
  * @param ret The error code
  * @param fmt Error string for the error code
@@ -98,6 +102,9 @@ krb5_vset_error_message (krb5_context context, krb5_error_code ret,
 {
     int r;
 
+    if (context == NULL)
+	return;
+
     HEIMDAL_MUTEX_lock(context->mutex);
     if (context->error_string) {
 	free(context->error_string);
@@ -114,6 +121,8 @@ krb5_vset_error_message (krb5_context context, krb5_error_code ret,
  * Prepend the context full error string for a specific error code.
  * The error that is stored should be internationalized.
  *
+ * The if context is NULL, no error string is stored.
+ *
  * @param context Kerberos 5 context
  * @param ret The error code
  * @param fmt Error string for the error code
@@ -137,6 +146,8 @@ krb5_prepend_error_message(krb5_context context, krb5_error_code ret,
 /**
  * Prepend the contexts's full error string for a specific error code.
  *
+ * The if context is NULL, no error string is stored.
+ *
  * @param context Kerberos 5 context
  * @param ret The error code
  * @param fmt Error string for the error code
@@ -151,6 +162,10 @@ krb5_vprepend_error_message(krb5_context context, krb5_error_code ret,
     __attribute__ ((format (printf, 3, 0)))
 {
     char *str = NULL, *str2 = NULL;
+
+    if (context == NULL)
+	return;
+
     HEIMDAL_MUTEX_lock(context->mutex);
     if (context->error_code != ret) {
 	HEIMDAL_MUTEX_unlock(context->mutex);