Commit bc4e2ae0 authored by Tiwei Bie's avatar Tiwei Bie Committed by Johannes Berg
Browse files

um: vfio: Prevent duplicate device assignments 



Ensure devices are assigned only once. Reject subsequent requests
for duplicate assignments.

Fixes: a0e2cb6a ("um: Add VFIO-based virtual PCI driver")
Signed-off-by: default avatarTiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20250606124428.148164-4-tiwei.btw@antgroup.com


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent c55c7a85

arch/um/drivers/vfio_kern.c

+14 −0
Original line number Diff line number Diff line
@@ -570,6 +570,17 @@ static void uml_vfio_release_device(struct uml_vfio_device *dev) 
	kfree(dev);

}



static struct uml_vfio_device *uml_vfio_find_device(const char *device)

{

	struct uml_vfio_device *dev;



	list_for_each_entry(dev, &uml_vfio_devices, list) {

		if (!strcmp(dev->name, device))

			return dev;

	}

	return NULL;

}



static int uml_vfio_cmdline_set(const char *device, const struct kernel_param *kp)

{

	struct uml_vfio_device *dev;
@@ -582,6 +593,9 @@ static int uml_vfio_cmdline_set(const char *device, const struct kernel_param *k 
		uml_vfio_container.fd = fd;

	}



	if (uml_vfio_find_device(device))

		return -EEXIST;



	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (!dev)

		return -ENOMEM;