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PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms

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In the PCI_MMAP_PROCFS case when the address being passed by the user is a
'user visible' resource address based on the bus window, and not the actual
contents of the resource, that's what we need to be checking it against.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
This commit is contained in:
David Woodhouse 2017-04-12 13:25:50 +01:00 committed by Bjorn Helgaas
parent c1ae3cfa0e
commit 6bccc7f426
1 changed files with 7 additions and 3 deletions
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10
drivers/pci/pci-sysfs.c
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@ -985,15 +985,19 @@ void pci_remove_legacy_files(struct pci_bus *b)
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
enum pci_mmap_api mmap_api)
{
unsigned long nr, start, size, pci_start;
unsigned long nr, start, size;
resource_size_t pci_start = 0, pci_end;
if (pci_resource_len(pdev, resno) == 0)
return 0;
nr = vma_pages(vma);
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
if (mmap_api == PCI_MMAP_PROCFS) {
pci_resource_to_user(pdev, resno, &pdev->resource[resno],
&pci_start, &pci_end);
pci_start >>= PAGE_SHIFT;
}
if (start >= pci_start && start < pci_start + size &&
start + nr <= pci_start + size)
return 1;