On 06/11/15 18:11, Dan Carpenter wrote:

Hello Jyri Sarha,

This is a semi-automatic email about new static checker warnings.

The patch 103cd8bc1c80: "drm/tilcdc: Add support for external tda998x encoder" from Feb 10, 2015, leads to the following Smatch complaint:

drivers/gpu/drm/tilcdc/tilcdc_external.c:153 tilcdc_get_external_components() error: we previously assumed 'node' could be null (see line 148)

drivers/gpu/drm/tilcdc/tilcdc_external.c 147 node = of_graph_get_remote_port_parent(ep); 148 if (!node && !of_device_is_available(node)) { ^^^^

This test is probably reversed?

Not reversed, but the && should be ||. Then we always hit the "continue", if node == NULL.

I'll make a fix for this tomorrow.

Thanks, Jyri

149				of_node_put(node);
                                         ^^^^

NULL.

150				continue;
151			}
152	
153			dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
                                                                 ^^^^^^^^^^^

Unchecked dereference.

154			if (match)
155				component_match_add(dev, match, dev_match_of, node);

regards, dan carpenter