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of: handle NULL node in next_child iterators

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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>
This commit is contained in:
Florian Fainelli 2014-05-28 10:39:02 -07:00 committed by Rob Herring
parent 64c5c75908
commit 43cb436787
1 changed files with 6 additions and 0 deletions
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6
drivers/of/base.c
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@ -700,6 +700,9 @@ static struct device_node *__of_get_next_child(const struct device_node *node,
{ {
struct device_node *next; struct device_node *next;
if (!node)
return NULL;
next = prev ? prev->sibling : node->child; next = prev ? prev->sibling : node->child;
for (; next; next = next->sibling) for (; next; next = next->sibling)
if (of_node_get(next)) 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; struct device_node *next;
unsigned long flags; unsigned long flags;
if (!node)
return NULL;
raw_spin_lock_irqsave(&devtree_lock, flags); raw_spin_lock_irqsave(&devtree_lock, flags);
next = prev ? prev->sibling : node->child; next = prev ? prev->sibling : node->child;
for (; next; next = next->sibling) { for (; next; next = next->sibling) {