linux-kernel - [PATCH 3.19 089/123] of: fix handling of / in options for of_find_node_by

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Date:	Tue, 24 Mar 2015 16:46:38 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Hurley <peter@...leysoftware.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Rob Herring <robh@...nel.org>
Subject: [PATCH 3.19 089/123] of: fix handling of / in options for of_find_node_by_path()

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Leif Lindholm <leif.lindholm@...aro.org>

commit 106937e8ccdcf0f4b95fbf0fe9abd42766cade33 upstream.

Ensure proper handling of paths with appended options (after ':'),
where those options may contain a '/'.

Fixes: 7914a7c5651a ("of: support passing console options with stdout-path")
Reported-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/of/base.c |   23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -714,16 +714,17 @@ static struct device_node *__of_find_nod
 						const char *path)
 {
 	struct device_node *child;
-	int len = strchrnul(path, '/') - path;
-	int term;
+	int len;
+	const char *end;
 
+	end = strchr(path, ':');
+	if (!end)
+		end = strchrnul(path, '/');
+
+	len = end - path;
 	if (!len)
 		return NULL;
 
-	term = strchrnul(path, ':') - path;
-	if (term < len)
-		len = term;
-
 	__for_each_child_of_node(parent, child) {
 		const char *name = strrchr(child->full_name, '/');
 		if (WARN(!name, "malformed device_node %s\n", child->full_name))
@@ -768,8 +769,12 @@ struct device_node *of_find_node_opts_by
 
 	/* The path could begin with an alias */
 	if (*path != '/') {
-		char *p = strchrnul(path, '/');
-		int len = separator ? separator - path : p - path;
+		int len;
+		const char *p = separator;
+
+		if (!p)
+			p = strchrnul(path, '/');
+		len = p - path;
 
 		/* of_aliases must not be NULL */
 		if (!of_aliases)
@@ -794,6 +799,8 @@ struct device_node *of_find_node_opts_by
 		path++; /* Increment past '/' delimiter */
 		np = __of_find_node_by_path(np, path);
 		path = strchrnul(path, '/');
+		if (separator && separator < path)
+			break;
 	}
 	raw_spin_unlock_irqrestore(&devtree_lock, flags);
 	return np;


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