提交 0d67e0fa 编写于 作者: H Heikki Krogerus 提交者: Rafael J. Wysocki

device property: fix for a case of use-after-free

In device_remove_property_set(), the secondary fwnode needs
to be cleared before the pset is freed. This fixes a
use-after-free when a property set is providing the primary
fwnode.

As a result of the fix, the primary fwnode may end up
containing ERR_PTR(-ENODEV), so also adding checks for it to
the property handling code.
Reported-by: NJohn Youn <John.Youn@synopsys.com>
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
上级 77812034
......@@ -218,7 +218,8 @@ bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
bool ret;
ret = __fwnode_property_present(fwnode, propname);
if (ret == false && fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
if (ret == false && !IS_ERR_OR_NULL(fwnode) &&
!IS_ERR_OR_NULL(fwnode->secondary))
ret = __fwnode_property_present(fwnode->secondary, propname);
return ret;
}
......@@ -423,7 +424,8 @@ EXPORT_SYMBOL_GPL(device_property_match_string);
int _ret_; \
_ret_ = FWNODE_PROP_READ(_fwnode_, _propname_, _type_, _proptype_, \
_val_, _nval_); \
if (_ret_ == -EINVAL && _fwnode_ && !IS_ERR_OR_NULL(_fwnode_->secondary)) \
if (_ret_ == -EINVAL && !IS_ERR_OR_NULL(_fwnode_) && \
!IS_ERR_OR_NULL(_fwnode_->secondary)) \
_ret_ = FWNODE_PROP_READ(_fwnode_->secondary, _propname_, _type_, \
_proptype_, _val_, _nval_); \
_ret_; \
......@@ -593,7 +595,8 @@ 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 && !IS_ERR_OR_NULL(fwnode->secondary))
if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
!IS_ERR_OR_NULL(fwnode->secondary))
ret = __fwnode_property_read_string_array(fwnode->secondary,
propname, val, nval);
return ret;
......@@ -621,7 +624,8 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
int ret;
ret = __fwnode_property_read_string(fwnode, propname, val);
if (ret == -EINVAL && fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
if (ret == -EINVAL && !IS_ERR_OR_NULL(fwnode) &&
!IS_ERR_OR_NULL(fwnode->secondary))
ret = __fwnode_property_read_string(fwnode->secondary,
propname, val);
return ret;
......@@ -820,11 +824,16 @@ void device_remove_property_set(struct device *dev)
* the pset. If there is no real firmware node (ACPI/DT) primary
* will hold the pset.
*/
if (!is_pset_node(fwnode))
fwnode = fwnode->secondary;
if (!IS_ERR(fwnode) && is_pset_node(fwnode))
if (is_pset_node(fwnode)) {
set_primary_fwnode(dev, NULL);
pset_free_set(to_pset_node(fwnode));
set_secondary_fwnode(dev, NULL);
} else {
fwnode = fwnode->secondary;
if (!IS_ERR(fwnode) && is_pset_node(fwnode)) {
set_secondary_fwnode(dev, NULL);
pset_free_set(to_pset_node(fwnode));
}
}
}
EXPORT_SYMBOL_GPL(device_remove_property_set);
......
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