ACPI / PCI: fix acpi_pci_irq_enable() memory leak

In acpi_pci_irq_enable(), 'entry' is allocated by kzalloc() in
acpi_pci_irq_check_entry() (invoked from acpi_pci_irq_lookup()). However,
it is not deallocated if acpi_pci_irq_valid() returns false, leading to a
memory leak. To fix this issue, free 'entry' before returning 0.

Fixes: e237a5518425 ("x86/ACPI/PCI: Recognize that Interrupt Line 255 means "not connected"")
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index d2549ae65e1b..dea8a60e18a4 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -449,8 +449,10 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
                  * No IRQ known to the ACPI subsystem - maybe the BIOS /
                  * driver reported one, then use it. Exit in any case.
                  */
-                if (!acpi_pci_irq_valid(dev, pin))
+                if (!acpi_pci_irq_valid(dev, pin)) {
+                        kfree(entry);
                         return 0;
+                }
 
                 if (acpi_isa_register_gsi(dev))
                         dev_warn(&dev->dev, "PCI INT %c: no GSI\n",