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| author | Ed Swierk <eswierk@aristanetworks.com> | 2008-11-04 01:41:16 +0300 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-11-04 01:41:16 +0300 |
| commit | 88e7df0b7ee717f9db3333fb1248827bbdb2d4d3 (patch) | |
| tree | c24dbb487be7f59869438974884f1aa86c48af19 | |
| parent | f5dafca52d366ef8c6c86cbdfecc71a9a78b63a6 (diff) | |
| download | linux-88e7df0b7ee717f9db3333fb1248827bbdb2d4d3.tar.xz | |
PCI: fix range check on mmapped sysfs resource files
pci_mmap_fits() returns the wrong answer if the sysfs resource file size
is not a multiple of the page size. vm_end and vm_start are already
page-aligned, so size - start < nr, causing mmap() to return EINVAL.
Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 110022d78689..5d72866897a8 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -575,7 +575,7 @@ static int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; start = vma->vm_pgoff; - size = pci_resource_len(pdev, resno) >> PAGE_SHIFT; + size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; if (start < size && size - start >= nr) return 1; WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n", |