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| author | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
| commit | 56c5d900dbb8e042bfad035d18433476931d8f93 (patch) | |
| tree | 00b793965beeef10db03e0ff021d2d965c410759 /drivers/pci/pci-sysfs.c | |
| parent | 4dd95b63ae25c5cad6986829b5e8788e9faa0330 (diff) | |
| parent | ead9d23d803ea3a73766c3cb27bf7563ac8d7266 (diff) | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
sound/core/memalloc.c
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 9c718583a23..77baff022f7 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> +#include <linux/sched.h> #include <linux/pci.h> #include <linux/stat.h> #include <linux/topology.h> @@ -484,6 +485,21 @@ pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr, #endif /* HAVE_PCI_LEGACY */ #ifdef HAVE_PCI_MMAP + +static int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma) +{ + unsigned long nr, start, size; + + nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; + start = vma->vm_pgoff; + size = pci_resource_len(pdev, resno) >> PAGE_SHIFT; + 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", + current->comm, start, start+nr, pci_name(pdev), resno, size); + return 0; +} + /** * pci_mmap_resource - map a PCI resource into user memory space * @kobj: kobject for mapping @@ -510,6 +526,9 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, if (i >= PCI_ROM_RESOURCE) return -ENODEV; + if (!pci_mmap_fits(pdev, i, vma)) + return -EINVAL; + /* pci_mmap_page_range() expects the same kind of entry as coming * from /proc/bus/pci/ which is a "user visible" value. If this is * different from the resource itself, arch will do necessary fixup. |