of: handle NULL node in next_child iterators
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 <zonque@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index e67b308..567e6e1 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -700,6 +700,9 @@
{
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 *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) {