linux-kernel - [PATCH] of: handle NULL node in of_get_next_available

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Message-Id: <1400874192-29400-1-git-send-email-f.fainelli@gmail.com>
Date:	Fri, 23 May 2014 12:43:11 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	devicetree@...r.kernel.org
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Daniel Mack <zonque@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] of: handle NULL node in of_get_next_available_child

Add an early check for the node argument in
of_get_next_available_child() to avoid dereferencing a NULL node pointer
a few lines after.

CC: Daniel Mack <zonque@...il.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/of/base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index e67b308819c9..9a71bfac78ae 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -746,6 +746,9 @@ 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

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