Thread (1 message) 1 message, 1 author, 2014-06-02

Re: [PATCH v2] of: handle NULL node in next_child iterators

From: Grant Likely <hidden>
Date: 2014-06-02 15:14:20

On Wed, 28 May 2014 10:39:02 -0700, Florian Fainelli [off-list ref] wrote:
Add an early check for the node argument in __of_get_next_child and
of_get_next_available_child() to avoid dereferencing a NULL node pointer
a few lines after.

CC: Daniel Mack <redacted>
Signed-off-by: Florian Fainelli <redacted>
Applied, thanks.

g
quoted hunk
---
Changes in v2:
- also fix __of_get_next_child against NULL node argument

 drivers/of/base.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index e67b308819c9..567e6e1b7921 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -700,6 +700,9 @@ static struct device_node *__of_get_next_child(const struct device_node *node,
 {
 	struct device_node *next;
 
+	if (!node)
+		return NULL;
+
 	next = prev ? prev->sibling : node->child;
 	for (; next; next = next->sibling)
 		if (of_node_get(next))
@@ -746,6 +749,9 @@ struct device_node *of_get_next_available_child(const struct device_node *node,
 	struct device_node *next;
 	unsigned long flags;
 
+	if (!node)
+		return NULL;
+
 	raw_spin_lock_irqsave(&devtree_lock, flags);
 	next = prev ? prev->sibling : node->child;
 	for (; next; next = next->sibling) {
-- 
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help