[PATCH v2 1/2] OF: base: add sanity checks to of_new/delete_property

[Sebastian Hesselbarth]

This adds some sanity checks to of_new_property and of_delete_property.
Also, value pointer is always allocated even with zero length to allow
empty properties to be distinguished from non-existing properties.
Finally, data passed to of_new_property is only copied if non-NULL.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Note: Patch 3 of the former patch set has been dropped in favour of zero
length allocation here.

Changelog:
v1->v2:
- remove unneccesary NULL checks after xzalloc (Suggested by Sascha Hauer)
- allocate zero length value pointer (Suggested by Sascha Hauer)

Cc: barebox at lists.infradead.org
---
 drivers/of/base.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 1b351ee..e65cf85 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1527,13 +1527,17 @@ struct property *of_new_property(struct device_node *node, const char *name,
 	struct property *prop;
 
 	prop = xzalloc(sizeof(*prop));
-
 	prop->name = strdup(name);
+	if (!prop->name) {
+		free(prop);
+		return NULL;
+	}
+
 	prop->length = len;
-	if (len) {
-		prop->value = xzalloc(len);
+	prop->value = xzalloc(len);
+
+	if (data)
 		memcpy(prop->value, data, len);
-	}
 
 	list_add_tail(&prop->list, &node->properties);
 
@@ -1542,6 +1546,9 @@ struct property *of_new_property(struct device_node *node, const char *name,
 
 void of_delete_property(struct property *pp)
 {
+	if (!pp)
+		return;
+
 	list_del(&pp->list);
 
 	free(pp->name);
-- 
1.7.2.5