[RFC PATCH 1/3] drivers: of: fix resources freeing in of_pci_get_host_bridge_resources()

[Lorenzo Pieralisi]

In the function of_pci_get_host_bridge_resources() if the parsing of
ranges fails, previously allocated resources inclusive of bus_range
are not freed and are not expected to be freed by the function caller
on error return.

This patch fixes the issues by adding code that properly frees resources
and bus_range before exiting the function with an error return value.

Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Liviu Dudau <liviu.dudau at arm.com>
Cc: Bjorn Helgaas <bhelgaas at google.com>
Cc: Rob Herring <robh+dt at kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
---
 drivers/of/of_pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 88471d3..6fbfe99 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -146,6 +146,7 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
 	struct of_pci_range_parser parser;
 	char range_type[4];
 	int err;
+	struct pci_host_bridge_window *window;
 
 	if (io_base)
 		*io_base = (resource_size_t)OF_BAD_ADDR;
@@ -225,7 +226,10 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
 conversion_failed:
 	kfree(res);
 parse_failed:
+	list_for_each_entry(window, resources, list)
+		kfree(window->res);
 	pci_free_resource_list(resources);
+	kfree(bus_range);
 	return err;
 }
 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
-- 
2.2.1