diff options
| author | Paul Burton <paul.burton@mips.com> | 2018-07-12 09:33:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-28 07:49:11 +0200 |
| commit | 650321fe96150898c69c58c6684b33edbe689de1 (patch) | |
| tree | 6ac8f91b3d0b9a9f95c87a4a45d51eba210caf91 /arch | |
| parent | 92f724130fac801b97aef580ae5e185a699661c4 (diff) | |
MIPS: Fix off-by-one in pci_resource_to_user()
commit 38c0a74fe06da3be133cae3fb7bde6a9438e698b upstream.
The MIPS implementation of pci_resource_to_user() introduced in v3.12 by
commit 4c2924b725fb ("MIPS: PCI: Use pci_resource_to_user to map pci
memory space properly") incorrectly sets *end to the address of the
byte after the resource, rather than the last byte of the resource.
This results in userland seeing resources as a byte larger than they
actually are, for example a 32 byte BAR will be reported by a tool such
as lspci as being 33 bytes in size:
Region 2: I/O ports at 1000 [disabled] [size=33]
Correct this by subtracting one from the calculated end address,
reporting the correct address to userland.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Reported-by: Rui Wang <rui.wang@windriver.com>
Fixes: 4c2924b725fb ("MIPS: PCI: Use pci_resource_to_user to map pci memory space properly")
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org # v3.12+
Patchwork: https://patchwork.linux-mips.org/patch/19829/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/pci/pci.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c index f6325fa657fb..64ae8c094a54 100644 --- a/arch/mips/pci/pci.c +++ b/arch/mips/pci/pci.c @@ -55,7 +55,7 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar, phys_addr_t size = resource_size(rsrc); *start = fixup_bigphys_addr(rsrc->start, size); - *end = rsrc->start + size; + *end = rsrc->start + size - 1; } int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, |