Process returned -1073741819 0xc0000005 - C (СИ)

void polusum(double **a,double *mas,int row,int col)
{int i=1,j=0;
    mas = (double *)malloc(col*sizeof(double));
    for(j=0;j<col;++j)
    {
        mas[j]=1.0;
        for(i=1;i<row-1;++i)
            if (a[i][j]>(a[i][j]+a[i][j])/2.0)
            {
                mas[j]=0.0;
                printf("%d",i);
                break;
            }
    }
}
 
void binmatrix(double **a,int row,int col,int p)
{int i,j;
    if (maxarr(a,row,col)-minarr(a,row,col)>p)
        for(i=0;i<row;++i)
            for(j=0;j<col;++j)
                if (a[i][j]>0.0)
                    a[i][j]=1.0;
                else
                    a[i][j]=0.0;
}