Seg fault: invalid pointer error

[Puneeth poduri]

i have a query ! the following code gives a segmentfault ! i tried debug mode and it says Invalid pointer please help !

class image
{
        public:
        int **matrix;
        int height,width;
        int pixelmax;
        image(int height,int width,int pixelmax)
        {
                this->height = height;
                this->width = width;
                this->pixelmax = pixelmax;
                init_matrix();
        }
        void init_matrix()
        {
                matrix = (int **)malloc(sizeof(int *)*width);
                for(int i=0;i<width;i++)
                        matrix[i] = (int *)malloc(sizeof(int)*height);
        }
        ~image()
        {
                if(matrix!=NULL)
                {
                        for(int i=0;i<width;i++)
                        {
                                free(matrix[i]);
                        }
                        free(matrix);
                }
        }
};

what is the problem ??

[Banfa]

Line 16/17: you allocate an array of width size and then accesses it for height items

[Puneeth poduri]

Oh ok but so far i have tested the code for a square matrix i.e. width = height

[Puneeth poduri]

The changes to the code have been made, the problem still persist. when i debug the program fails once my image reference goes out of scope . i.e. when the destructor is called. once i try to remove 'free(matrix[i])' it fails i.e. it says the matrix[0] is an invalid pointer .

[weaknessforcats]

Please post your main(). The problem may be in how you use your class.