uio: pci_sva: correct '-ENODEV' check logic

The current '-ENODEV' check uses '&&', which can lead to a NULL pointer
dereference when udev is NULL.

Fix the condition to return -ENODEV if either udev or its pdev is NULL.

Fixes: 3397c3c ("uio: Add SVA support for PCI devices via uio_pci_generic_sva.c")
Signed-off-by: Haiyue Wang <haiyuewa@163.com>
Link: https://patch.msgid.link/20260109175448.34309-1-haiyuewa@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: haiyuewa

drivers/uio/uio_pci_generic_sva.c

@@ -29,7 +29,7 @@ static int uio_pci_sva_open(struct uio_info *info, struct inode *inode)
 	struct uio_pci_sva_dev *udev = info->priv;
 	struct iommu_domain *domain;
 
-	if (!udev && !udev->pdev)
+	if (!udev || !udev->pdev)
 		return -ENODEV;
 
 	domain = iommu_get_domain_for_dev(&udev->pdev->dev);
@@ -51,7 +51,7 @@ static int uio_pci_sva_release(struct uio_info *info, struct inode *inode)
 {
 	struct uio_pci_sva_dev *udev = info->priv;
 
-	if (!udev && !udev->pdev)
+	if (!udev || !udev->pdev)
 		return -ENODEV;
 
 	iommu_sva_unbind_device(udev->sva_handle);