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

From: Andy Shevchenko
Date: Tue Dec 29 2015 - 06:08:34 EST


From: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
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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