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xen/pciback: Check dev_data before using it

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[ Upstream commit 1669907e3d ]

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@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ross Lagerwall 2018-12-14 12:55:45 +00:00 committed by Greg Kroah-Hartman
parent e8113c362a
commit e50bf6849f
1 changed files with 2 additions and 1 deletions
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3
drivers/xen/xen-pciback/pci_stub.c
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@ -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);