From: David Woodhouse Date: Wed, 12 Apr 2017 12:25:50 +0000 (+0100) Subject: PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6bccc7f426abd640f08d8c75fb22f99483f201b4;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms 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 Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org --- diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 25d010d449a3..7ac258fd3c5c 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;