linux-kernel - [PATCH 3.16.y-ckt 058/133] of/address: Don't loop forever in of_find_matching_node_by

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Message-Id: <1443606681-7124-59-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 30 Sep 2015 10:50:06 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	David Daney <david.daney@...ium.com>,
	Rob Herring <robh@...nel.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 058/133] of/address: Don't loop forever in of_find_matching_node_by_address().

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

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

From: David Daney <david.daney@...ium.com>

commit 3a496b00b6f90c41bd21a410871dfc97d4f3c7ab upstream.

If the internal call to of_address_to_resource() fails, we end up
looping forever in of_find_matching_node_by_address().  This can be
caused by a defective device tree, or calling with an incorrect
matches argument.

Fix by calling of_find_matching_node() unconditionally at the end of
the loop.

Signed-off-by: David Daney <david.daney@...ium.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/of/address.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index bab28871b992..5af2a0deff14 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -691,10 +691,10 @@ struct device_node *of_find_matching_node_by_address(struct device_node *from,
 	struct resource res;
 
 	while (dn) {
-		if (of_address_to_resource(dn, 0, &res))
-			continue;
-		if (res.start == base_address)
+		if (!of_address_to_resource(dn, 0, &res) &&
+		    res.start == base_address)
 			return dn;
+
 		dn = of_find_matching_node(dn, matches);
 	}
 
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