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Subject[PATCH 1/2] PCI: dwc: allow to limit registers set length
Date
Add length to the struct dw_pcie and check that the accessors
dw_pcie_(rd|wr)_own_conf() do not read/write beyond that point.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 4 ++++
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 5 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 29a05759a294..b422538ee0bb 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -29,6 +29,8 @@ static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
return pp->ops->rd_own_conf(pp, where, size, val);

pci = to_dw_pcie_from_pp(pp);
+ if (pci->dbi_length && where + size > pci->dbi_length)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
return dw_pcie_read(pci->dbi_base + where, size, val);
}

@@ -41,6 +43,8 @@ static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
return pp->ops->wr_own_conf(pp, where, size, val);

pci = to_dw_pcie_from_pp(pp);
+ if (pci->dbi_length && where + size > pci->dbi_length)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
return dw_pcie_write(pci->dbi_base + where, size, val);
}

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 9f1a5e399b70..5be5f369abf2 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -215,6 +215,7 @@ struct dw_pcie {
struct device *dev;
void __iomem *dbi_base;
void __iomem *dbi_base2;
+ int dbi_length;
u32 num_viewport;
u8 iatu_unroll_enabled;
struct pcie_port pp;
--
2.19.1
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