[Xen-devel] [PATCH] xen/pciback: Check dev_data before using it

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

If pcistub_init_device fails, the release function will be called with
dev_data set to NULL.  Check it before using it to avoid a NULL pointer
dereference.

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 drivers/xen/xen-pciback/pci_stub.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c 
b/drivers/xen/xen-pciback/pci_stub.c
index 59661db144e5..097410a7cdb7 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -106,7 +106,8 @@ static void pcistub_device_release(struct kref *kref)
         * is called from "unbind" which takes a device_lock mutex.
         */
        __pci_reset_function_locked(dev);
-       if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
+       if (dev_data &&
+           pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
                dev_info(&dev->dev, "Could not reload PCI state\n");
        else
                pci_restore_state(dev);
-- 
2.17.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel