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Subject[PATCH v2 01/27] pci: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms
Date
From: David Woodhouse <dwmw@amazon.co.uk>

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>
Cc: stable@vger.kernel.org
---
drivers/pci/pci-sysfs.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 25d010d..7ac258f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -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;
--
2.9.3
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