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| author |   Ross Lagerwall <ross.lagerwall@citrix.com> | 2018-12-14 12:55:45 +0000 |
|---|---|---|
| committer |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2018-12-17 10:29:50 -0500 |
| commit | 1669907e3d1abfa3f7586e2d55dbbc117b5adba2 (patch) | |
| tree | 623ecc6144a0983d5a7d0bc13f1abfa14207e819 | |
| parent | kprobes/x86/xen: blacklist non-attachable xen interrupt functions (diff) | |
| download | wireguard-linux-1669907e3d1abfa3f7586e2d55dbbc117b5adba2.tar.xz wireguard-linux-1669907e3d1abfa3f7586e2d55dbbc117b5adba2.zip | |
xen/pciback: Check dev_data before using it
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>
| -rw-r--r-- | drivers/xen/xen-pciback/pci_stub.c | 3 |
1 files changed, 2 insertions, 1 deletions
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); |