ERROR: AddressSanitizer: heap-buffer-overflow on address X at pc Y bp Z sp W
<p>I'm pretty new to dynamic memory management and using Fsanitise flag to find problems with memory management. I cannot use vector to store data - I need to use primitive arrays, as well as "new" and "delete" to manage the heap objects.</p>

<p>I got the following error when I try to run the EuclideanVectorTester compiled program but not sure what the problem is, will someone enlighten me please?</p>

<pre><code>weill % make
g++ -std=c++14 -Wall -Werror -O2 -fsanitize=address -c EuclideanVectorTester.cpp
g++ -std=c++14 -Wall -Werror -O2 -fsanitize=address -c EuclideanVector.cpp
g++ -fsanitize=address EuclideanVectorTester.o EuclideanVector.o -o EuclideanVectorTester
weill % ./EuclideanVectorTester
1
=================================================================
==15341==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb59007e0 at pc 0x8048ca7 bp 0xbfb47388 sp 0xbfb4737c
WRITE of size 8 at 0xb59007e0 thread T0
    #0 0x8048ca6 in main (/tmp_amd/kamen/export/kamen/3/z3386180/cs6771/evec/EuclideanVectorTester+0x8048ca6)
    #1 0xb6ecae45 in __libc_start_main (/lib/i386-linux-gnu/i686/cmov/libc.so.6+0x16e45)

0xb59007e0 is located 0 bytes to the right of 16-byte region [0xb59007d0,0xb59007e0)
allocated by thread T0 here:
    #0 0xb722a4c4 in operator new[](unsigned int) (/usr/lib/libasan.so.1+0x524c4)
    #1 0x8048b9a in main (/tmp_amd/kamen/export/kamen/3/z3386180/cs6771/evec/EuclideanVectorTester+0x8048b9a)
    #2 0xb6ecae45 in __libc_start_main (/lib/i386-linux-gnu/i686/cmov/libc.so.6+0x16e45)
    #3 0x8048d8c (/tmp_amd/kamen/export/kamen/3/z3386180/cs6771/evec/EuclideanVectorTester+0x8048d8c)

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 main
Shadow bytes around the buggy address:
  0x36b200a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b200b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b200c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b200d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b200e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=&gt;0x36b200f0: fa fa fa fa fa fa fa fa fa fa 00 00[fa]fa 04 fa
  0x36b20100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b20110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b20120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b20130: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b20140: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Contiguous container OOB:fc
  ASan internal:           fe
==15341==ABORTING
weill %
</code></pre>

<p>The EuclideanVector.h file is this:</p>

<pre><code>#ifndef _EuclideanVector_h
#define _EuclideanVector_h

#include &lt;iostream&gt;
#include &lt;algorithm&gt;


namespace even {
    class EuclideanVector {

        public:

            /*
             * A constructor that takes the number of dimensions (as an unsigned int) but no magnitudes, 
             * sets the magnitude in each dimension as 0.0. This is the default constructor, with the default value being 1.
             */
            template &lt;typename NUM&gt;
            EuclideanVector(const NUM dimensions = 1): 
                  EuclideanVector(dimensions, 0.0) {}; // delegating constructor; default constructor that takes in dimensions if there is user input, otherwise dimensions = 1 if it is an empty constructor

            // target constructor for delegating constructor
            template &lt;typename NUM1, typename NUM2&gt; // any numeric types of user input for dimensions and magnitude will be static_cast to unsigned int and double respectively
            EuclideanVector(const NUM1 dimensions, const NUM2 magnitude){

                        // static cast to unsigned int and assign dimensions_ to that
                        dimensions_ = new unsigned int (static_cast&lt;unsigned int&gt;(dimensions));

                        // assign pointer "magnitude_" to dynamically-allocated memory of new unnamed array&lt;double&gt; object of size "dimensions_"
                        magnitude_  =  new double [*dimensions_];

                        // fill the array&lt;double&gt; object "magnitude_" a number of "dimensions_" times, with the &lt;double&gt; value of "magnitude_" for each dimension
                        std::fill_n(magnitude_, dimensions_, static_cast&lt;double&gt;(magnitude));

                  }

            /*
             * Destructor: ~EuclideanVector
             * The destructor deallocates any memory acquired by the constructors. 
             */
            ~EuclideanVector();


            /*
             * Member function: getMagnitude()
             * Returns a double containing the number of dimensions in a particular array.
             */
            const double&amp; getMagnitude () const;


            /*
             * Member function: getNumDimensions()
             * Returns an unsigned int containing the number of dimensions in a particular vector.
             */
            unsigned int getNumDimensions() const;


        private:
        /* Everything from here to the end of the class is private, so
         * not accessible or intended for use for the client */

            unsigned int *dimensions_;
            double *magnitude_;
            //double normal_;
        };
}

#endif
</code></pre>

<p>The EuclideanVector.cpp file is this:</p>

<pre><code>#include "EuclideanVector.h"
#include &lt;algorithm&gt;
#include &lt;cmath&gt; // for sqrt
#include &lt;sstream&gt;
#include &lt;iterator&gt;

namespace even {

    unsigned int EuclideanVector::getNumDimensions () const
    {
        return *dimensions_;
    }

    const double&amp; EuclideanVector::getMagnitude () const
    {
        return *magnitude_;
    }

    // destructor
    EuclideanVector::~EuclideanVector() {
        delete dimensions_;
        delete [] magnitude_;
    }
}
</code></pre>

<p>and the EuclideanVectorTester.cpp file is this:</p>

<pre><code>#include &lt;iostream&gt;
#include &lt;vector&gt;
#include &lt;list&gt;

#include "EuclideanVector.h"

int main() {

    std::cout &lt;&lt; "1" &lt;&lt; std::endl;

    evec::EuclideanVector a(2); 


    std::cout &lt;&lt; "2" &lt;&lt; std::endl;
    std::cout &lt;&lt; "3" &lt;&lt; std::end;

}
</code></pre>