static int mem_resize(jas_stream_memobj_t *m, size_t bufsize)
{
	unsigned char *buf;

	//assert(m->buf_);
	//assert(bufsize >= 0);

	JAS_DBGLOG(100, ("mem_resize(%p, %zu)\n", m, bufsize));
	if (!bufsize) {
		jas_eprintf(
		  "mem_resize was not really designed to handle a buffer of size 0\n"
		  "This may not work.\n"
		);
	}

	if (!(buf = jas_realloc2(m->buf_, bufsize, sizeof(unsigned char))) &&
	  bufsize) {
		JAS_DBGLOG(100, ("mem_resize realloc failed\n"));
		return -1;
	}
	JAS_DBGLOG(100, ("mem_resize realloc succeeded\n"));
	m->buf_ = buf;
	m->bufsize_ = bufsize;
	return 0;
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.