Correct way to free double pointers

Question

What is the correct way to free a float ** like below.

e.g. float ** someArray

for(int i = 0; i < numberOfDimensions; i++)
    {
        somearray[i] = (float *) malloc(numberOfDimensions * sizeof(float));
    }

Answer 1

If you have malloc'ed another round of memory and assigned it to each float pointer in the original array, then you should free them as well beforehand:

int i;
for (i = 0; i < numberOfDimensions; i++)
    free(someArray[i]);

// and free the container array only now

free(someArray);

P. s.: don't cast the return value of malloc.