When using a pci device through the vfio-pci driver, other software was
also able to access the pci device memory through sysfs.
To prevent this, when mmap is performed through sysfs, a process of
checking whether the device is in use is added.
Signed-off-by: Seunggyun Lee <sglee97@xxxxxxxxxxxxx>
---
drivers/pci/mmap.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c
index 4504039056d1..4c9df2e23e03 100644
--- a/drivers/pci/mmap.c
+++ b/drivers/pci/mmap.c
@@ -25,6 +25,8 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
{
unsigned long size;
int ret;
+ if (pdev->driver)
+ return -1;
size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
if (vma->vm_pgoff + vma_pages(vma) > size)
--
2.25.1
