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authorPaul Burton <paul.burton@mips.com>2018-07-12 19:33:04 +0300
committerPaul Burton <paul.burton@mips.com>2018-07-16 18:22:31 +0300
commit38c0a74fe06da3be133cae3fb7bde6a9438e698b (patch)
tree7091c8c356b49a799f3c4fc04d8e48f61aef87ed /arch/mips/pci
parent9d3cce1e8b8561fed5f383d22a4d6949db4eadbe (diff)
downloadlinux-38c0a74fe06da3be133cae3fb7bde6a9438e698b.tar.xz
MIPS: Fix off-by-one in pci_resource_to_user()
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/
Diffstat (limited to 'arch/mips/pci')
-rw-r--r--arch/mips/pci/pci.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index 9632436d74d7..c2e94cf5ecda 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -54,5 +54,5 @@ 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;
}