Core dump when procedure returns more than 1 result set

CREATE OR REPLACE TABLE odbcbug(col1 INT, col2 INT);

INSERT INTO odbcbug VALUES(1,2),(3,4),(5,6);

delimiter //

CREATE OR REPLACE PROCEDURE odbcbugp1()

BEGIN

  SELECT col1, col2 FROM odbcbug;

  SELECT col1 FROM odbcbug;

END;

//

CREATE OR REPLACE PROCEDURE odbcbugp2()

BEGIN

  SELECT col1 FROM odbcbug;

  SELECT col1, col2 FROM odbcbug;

END;

//

#include <stdio.h>

#include <string.h>

#include <sqlext.h>

int main(int argc, char *argv[])

   {

   SQLHANDLE hEnv, hConn, hStmt;

   SQLRETURN nRet;

   SQLCHAR szConnStr[2048];

   SQLCHAR szErrMsg[256];

   SQLLEN nInd;

   SQLSMALLINT nCols;

   int i;

   SQLCHAR szSQLState[5];

   SQLINTEGER nNativeErr;

   SQLSMALLINT sLen;

   SQLCHAR szDriverVer[256];

   SQLCHAR *pSQL;

   SQLCHAR szBuf[1024];

   if(argc < 2)

      {

      fprintf(stderr, "Usage: %s <SQL>\n", argv[0]);

      return 1;

      }

   pSQL = argv[1];

   SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnv);

   SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);

   SQLAllocHandle(SQL_HANDLE_DBC, hEnv, &hConn);

   strcpy(szConnStr, "DSN=MariaDB;UID=root;");

   if((nRet = SQLDriverConnect(hConn, NULL, szConnStr, SQL_NTS, NULL, 0,

     &sLen, SQL_DRIVER_NOPROMPT)) != SQL_SUCCESS)

      {

      SQLError(hEnv, hConn, SQL_NULL_HSTMT, NULL, NULL, szErrMsg, sizeof(szErrMsg), NULL);

      fprintf(stderr, "Error in connecting to MariaDB:\n%s\n", szErrMsg);

      return 1;

      }

   SQLAllocHandle(SQL_HANDLE_STMT, hConn, &hStmt);

   if((nRet = SQLExecDirect(hStmt, pSQL, SQL_NTS)) != SQL_SUCCESS)

      {

      SQLError(hEnv, hConn, hStmt, NULL, NULL, szErrMsg, sizeof(szErrMsg), NULL);

      fprintf(stderr, "Error in connecting to MariaDB:\n%s\nin\n%s\n", szErrMsg, pSQL);

      return 1;

      }

   for(;;)

      {

      SQLNumResultCols(hStmt, &nCols);

      printf("Num cols: %d\n", nCols);

      while((nRet = SQLFetch(hStmt)) == SQL_SUCCESS)

         {

         for(i = 0; i < nCols; i++)

            {

            if((nRet = SQLGetData(hStmt, i + 1, SQL_C_CHAR, szBuf, sizeof(szBuf),

              &nInd)) != SQL_SUCCESS)

               {

               SQLError(hEnv, hConn, hStmt, NULL, NULL, szErrMsg, sizeof(szErrMsg), NULL);

               fprintf(stderr, "Error in SQLGetData:\n%s\n", szErrMsg);

               return 1;

               }

            printf("Col: %d = /%s/\n", i + 1, nInd == SQL_NULL_DATA ? "null" : ((char *) szBuf));

            }

         }

      if(nRet != SQL_NO_DATA)

         {

         SQLError(hEnv, hConn, hStmt, NULL, NULL, szErrMsg, sizeof(szErrMsg), NULL);

         fprintf(stderr, "Error in SQLFetch:\n%s\n", szErrMsg);

         return 1;

         }

      if((nRet = SQLMoreResults(hStmt)) != SQL_SUCCESS)

         {

         if(nRet == SQL_NO_DATA)

            {

            printf("No more results\n");

            break;

            }

         SQLError(hEnv, hConn, hStmt, szSQLState, &nNativeErr, szErrMsg, sizeof(szErrMsg),

           &sLen)  ;

         fprintf(stderr, "Err: %d SQL State: %5.5s\n", nRet, szSQLState);

         fprintf(stderr, "Native Error: %d\n", nNativeErr);

         fprintf(stderr, "Error in SQLMoreResults:\n%s\n", szErrMsg);

         return 1;

         }

     }

   return 0;

   }

$ ./odbcbug "call odbcbugp1"

Num cols: 2

Col: 1 = /1/

Col: 2 = /2/

Col: 1 = /3/

Col: 2 = /4/

Col: 1 = /5/

Col: 2 = /6/

Num cols: 1

Col: 1 = /1/

Col: 1 = /3/

Col: 1 = /5/

No more results

$ ./odbcbug "call odbcbugp2"

Num cols: 1

Col: 1 = /1/

Col: 1 = /3/

Col: 1 = /5/

Num cols: 2

Col: 1 = /1/

Segmentation fault (core dumped)