int msPostGISLayerClose(layerObj *layer)
{
#ifdef USE_POSTGIS

  if (layer->debug) {
    msDebug("msPostGISLayerClose called: %s\n", layer->data);
  }

  if( layer->layerinfo ) {
    msPostGISFreeLayerInfo(layer);
  }

  return MS_SUCCESS;
#else
  msSetError( MS_MISCERR,
              "PostGIS support is not available.",
              "msPostGISLayerClose()");
  return MS_FAILURE;
#endif
}

The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.