avoid potential segfault when fed nonsense

diff --git a/src/smpi/bindings/smpi_pmpi.cpp b/src/smpi/bindings/smpi_pmpi.cpp
index 43cbdb8..6b831d5 100644 (file)
--- a/src/smpi/bindings/smpi_pmpi.cpp
+++ b/src/smpi/bindings/smpi_pmpi.cpp
@@ -215,7 +215,7 @@ int PMPI_Error_class(int errorcode, int* errorclass) {
 }
 
 int PMPI_Error_string(int errorcode, char* string, int* resultlen){
 }
 
 int PMPI_Error_string(int errorcode, char* string, int* resultlen){

-  if (errorcode<0 || string ==nullptr){
+  if (errorcode<0 || errorcode>= MPI_MAX_ERROR_STRING || string ==nullptr){

     return MPI_ERR_ARG;
   } else {
     static const char *smpi_error_string[] = {
     return MPI_ERR_ARG;
   } else {
     static const char *smpi_error_string[] = {