VFIO fixes for v5.13-rc5

- Fix error path return value (Zhen Lei)
 
  - Add vfio-pci CONFIG_MMU dependency (Randy Dunlap)
 
  - Replace open coding with struct_size() (Gustavo A. R. Silva)
 
  - Fix sample driver error path (Wei Yongjun)
 
  - Fix vfio-platform error path module_put() (Max Gurtovoy)
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Merge tag 'vfio-v5.13-rc5' of git://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:

 - Fix error path return value (Zhen Lei)

 - Add vfio-pci CONFIG_MMU dependency (Randy Dunlap)

 - Replace open coding with struct_size() (Gustavo A. R. Silva)

 - Fix sample driver error path (Wei Yongjun)

 - Fix vfio-platform error path module_put() (Max Gurtovoy)

* tag 'vfio-v5.13-rc5' of git://github.com/awilliam/linux-vfio:
  vfio/platform: fix module_put call in error flow
  samples: vfio-mdev: fix error handing in mdpy_fb_probe()
  vfio/iommu_type1: Use struct_size() for kzalloc()
  vfio/pci: zap_vma_ptes() needs MMU
  vfio/pci: Fix error return code in vfio_ecap_init()

drivers/vfio/pci/Kconfig

@@ -2,6 +2,7 @@
 config VFIO_PCI
 	tristate "VFIO support for PCI devices"
 	depends on VFIO && PCI && EVENTFD
+	depends on MMU
 	select VFIO_VIRQFD
 	select IRQ_BYPASS_MANAGER
 	help

drivers/vfio/pci/vfio_pci_config.c

@@ -1581,7 +1581,7 @@ static int vfio_ecap_init(struct vfio_pci_device *vdev)
 			if (len == 0xFF) {
 				len = vfio_ext_cap_len(vdev, ecap, epos);
 				if (len < 0)
-					return ret;
+					return len;
 			}
 		}
 

drivers/vfio/platform/vfio_platform_common.c

@@ -291,7 +291,7 @@ err_irq:
 	vfio_platform_regions_cleanup(vdev);
 err_reg:
 	mutex_unlock(&driver_lock);
-	module_put(THIS_MODULE);
+	module_put(vdev->parent_module);
 	return ret;
 }
 

drivers/vfio/vfio_iommu_type1.c

@@ -2795,7 +2795,7 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu,
 		return 0;
 	}
 
-	size = sizeof(*cap_iovas) + (iovas * sizeof(*cap_iovas->iova_ranges));
+	size = struct_size(cap_iovas, iova_ranges, iovas);
 
 	cap_iovas = kzalloc(size, GFP_KERNEL);
 	if (!cap_iovas)

samples/vfio-mdev/mdpy-fb.c

@@ -117,22 +117,27 @@ static int mdpy_fb_probe(struct pci_dev *pdev,
 	if (format != DRM_FORMAT_XRGB8888) {
 		pci_err(pdev, "format mismatch (0x%x != 0x%x)\n",
 			format, DRM_FORMAT_XRGB8888);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_release_regions;
 	}
 	if (width < 100	 || width > 10000) {
 		pci_err(pdev, "width (%d) out of range\n", width);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_release_regions;
 	}
 	if (height < 100 || height > 10000) {
 		pci_err(pdev, "height (%d) out of range\n", height);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_release_regions;
 	}
 	pci_info(pdev, "mdpy found: %dx%d framebuffer\n",
 		 width, height);
 
 	info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev);
-	if (!info)
+	if (!info) {
+		ret = -ENOMEM;
 		goto err_release_regions;
+	}
 	pci_set_drvdata(pdev, info);
 	par = info->par;