linux-kernel - [PATCH] device property: fix a potential oops

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Date:	Wed, 27 Apr 2016 14:04:20 +0300
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] device property: fix a potential oops

Since fwnode may hold ERR_PTR(-ENODEV) or it may point to
NULL, the fwnode type checks is_of_node(), is_acpi_node()
and is is_pset_node() need to consider it. Using
IS_ERR_OR_NULL() to check it.

Fixes: 0d67e0fa1664 ("device property: fix for a case of use-after-free")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/base/property.c | 2 +-
 include/acpi/acpi_bus.h | 4 ++--
 include/linux/of.h      | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 210423d..f38c21d 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -26,7 +26,7 @@ struct property_set {
 
 static inline bool is_pset_node(struct fwnode_handle *fwnode)
 {
-	return fwnode && fwnode->type == FWNODE_PDATA;
+	return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_PDATA;
 }
 
 static inline struct property_set *to_pset_node(struct fwnode_handle *fwnode)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a84fd15..4d40e9b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -394,13 +394,13 @@ struct acpi_data_node {
 
 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 {
-	return fwnode && (fwnode->type == FWNODE_ACPI
+	return !IS_ERR_OR_NULL(fwnode) && (fwnode->type == FWNODE_ACPI
 		|| fwnode->type == FWNODE_ACPI_DATA);
 }
 
 static inline bool is_acpi_device_node(struct fwnode_handle *fwnode)
 {
-	return fwnode && fwnode->type == FWNODE_ACPI;
+	return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_ACPI;
 }
 
 static inline struct acpi_device *to_acpi_device_node(struct fwnode_handle *fwnode)
diff --git a/include/linux/of.h b/include/linux/of.h
index 520cf2d..c7292e8 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -150,7 +150,7 @@ void of_core_init(void);
 
 static inline bool is_of_node(struct fwnode_handle *fwnode)
 {
-	return fwnode && fwnode->type == FWNODE_OF;
+	return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_OF;
 }
 
 static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
-- 
2.8.0.rc3