Q: Given the following code slice:
```
1 quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
17   for (row = 0; row < num_rows; row++) {
18     /* Initialize output values to 0 so can process components separately */
19     jzero_far((void *) output_buf[row], (size_t) (width * sizeof(JSAMPLE)));```
which has a CWE-476 vulnerability at line:
```
19     jzero_far((void *) output_buf[row], (size_t) (width * sizeof(JSAMPLE)));
```
Please analyze the root cause of the vulnerability.