of/pci: Free resources on failure in of_pci_get_host_bridge_resources()

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.

Fixes: cbe4097f8ae6 ("of/pci: Add support for parsing PCI host bridge resources from DT")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Rob Herring <robh+dt@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 88471d3d98cd..60dc36c865b5 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -140,6 +140,7 @@ int of_pci_get_host_bridge_resources(struct device_node *dev,
                         unsigned char busno, unsigned char bus_max,
                         struct list_head *resources, resource_size_t *io_base)
 {
+        struct pci_host_bridge_window *window;
         struct resource *res;
         struct resource *bus_range;
         struct of_pci_range range;
@@ -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);