heap overflow

[studentffm]

Hi

I got the following error message:

Debug Assertion Failed!

Program: .exe
File:f:\dd\vctools\crt_bld\self_x86\crt\src\dbgheap.c
Line:584

Expression: (_HEAP_MAXREQ / nNum) >= nSize

Outside the main() function I have a function which I use for dynamic memory allocation of 2D array

double **zweidmatrix(int zeilen, int spalten)

   {
	int l;
	double **matrix;

   matrix = (double **)calloc(zeilen, sizeof(double *));
   if(NULL == matrix) printf("Kein Virtueller RAM mehr vorhanden ... !");

   for(l=0; l < zeilen; l++)

      {
      matrix[l] = (double *)calloc(spalten, sizeof(double));
      if(NULL == matrix[l]) printf("Kein Virtueller RAM mehr vorhanden ... !");
      }
	return matrix;
   }

In a debug mode break point is triggered for the line:
matrix[l] = (double *)calloc(spalten, sizeof(double));

Does anyone have an idea for the problem??

10x

[writetonsharma]

The code look fine. Are you checking that zeilen or spalten are not getting any garbage values?

because if you give it a big value lets say 536870912:

_HEAP_MAXREQ / nNum >= nsize; //nsize = 8 for a double, nNum = 536870912

so the assertion will fail, this will give a value less than 8.

[studentffm]

Hi,

actually spalten takes such garbage values... but I cannot figure out why....