Thread: This may be due to a corruption of the heap

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i have the same problem on visual studio 2010. Here is the code:

Code:

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>

typedef char labeltype;

typedef struct __celltype {
        labeltype label;
        struct __celltype *first_child;
        struct __celltype *next_sib;
        struct __celltype *last_child;
        int zadnji;
} celltype;

   typedef celltype *node;
   typedef celltype *TREE;

   void MAKE_NULL( TREE* X ){
   
	   celltype* novo_stablo = (TREE)malloc( sizeof( celltype ) );
	   *X = novo_stablo;
	   (*X)->label = '\0';
	   (*X)->first_child = NULL;
	   (*X)->next_sib = NULL;
	   (*X)->last_child = NULL;
	   (*X)->zadnji = 1;
   
   }


   void __FREE( TREE* stablo ){
	    
	   celltype* pom = (*stablo) -> next_sib;

	   if( (*stablo) -> first_child != NULL ) __FREE( &( (*stablo)->first_child ) );

	   if( pom == NULL ){ free( stablo ); return; }

	   while( pom != NULL ){
	   
		   celltype* brisi = *stablo;
		   *stablo = pom;
		   pom = pom ->next_sib;
		   free( brisi );
	   
	   }

	   return;

   }

int _tmain(int argc, _TCHAR* argv[])
{
	TREE X;

	MAKE_NULL( &X );

	 __FREE( &X ); // here is the error by visual studio

	return 0;
}

i compiled and runned program on devcpp and codeblocks and they didnt noticed any errors

*stablo solves it.( wondering why i didnt saw that mistake )
( I did the allocation in MAKE_NULL function ). Thanks