linux-kernel - [PATCH v3 2/3] device property: the secondary fwnode needs to depend on the primary

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Date:	Tue, 29 Dec 2015 13:07:49 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, heikki.krogerus@...ux.intel.com,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	linux-acpi@...r.kernel.org
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v3 2/3] device property: the secondary fwnode needs to depend on the primary

From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

This fixes NULL pointer dereference when the primary fwnode handle
does not exist, for example with PCI devices that do not have ACPI
companion.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/base/property.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 0b22c8a..b3429cc 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -218,7 +218,7 @@ bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
 	bool ret;
 
 	ret = __fwnode_property_present(fwnode, propname);
-	if (ret == false && fwnode->secondary)
+	if (ret == false && fwnode && fwnode->secondary)
 		ret = __fwnode_property_present(fwnode->secondary, propname);
 	return ret;
 }
@@ -423,7 +423,7 @@ EXPORT_SYMBOL_GPL(device_property_match_string);
 	int _ret_;									\
 	_ret_ = FWNODE_PROP_READ(_fwnode_, _propname_, _type_, _proptype_,		\
 				 _val_, _nval_);					\
-	if (_ret_ == -EINVAL && _fwnode_->secondary)					\
+	if (_ret_ == -EINVAL && _fwnode_ && _fwnode_->secondary)			\
 		_ret_ = FWNODE_PROP_READ(_fwnode_->secondary, _propname_, _type_,	\
 				_proptype_, _val_, _nval_);				\
 	_ret_;										\
@@ -593,7 +593,7 @@ int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
 	int ret;
 
 	ret = __fwnode_property_read_string_array(fwnode, propname, val, nval);
-	if (ret == -EINVAL && fwnode->secondary)
+	if (ret == -EINVAL && fwnode && fwnode->secondary)
 		ret = __fwnode_property_read_string_array(fwnode->secondary,
 							  propname, val, nval);
 	return ret;
@@ -621,7 +621,7 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
 	int ret;
 
 	ret = __fwnode_property_read_string(fwnode, propname, val);
-	if (ret == -EINVAL && fwnode->secondary)
+	if (ret == -EINVAL && fwnode && fwnode->secondary)
 		ret = __fwnode_property_read_string(fwnode->secondary,
 						    propname, val);
 	return ret;
-- 
2.6.4

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