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PCI: dwc: Fix dw_pcie_ops NULL pointer dereference

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Fix a crash from dereferencing a NULL dw_pcie_ops pointer.  For example,
on ARTPEC-6:

  Unable to handle kernel NULL pointer dereference at virtual address 00000004
  pgd = c0204000
  [00000004] *pgd=00000000
  Internal error: Oops: 5 [#1] SMP ARM
  Modules linked in:
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc3-next-20170321 #1
  Hardware name: Axis ARTPEC-6 Platform
  task: db098000 task.stack: db096000
  PC is at dw_pcie_writel_dbi+0x2c/0xd0

Prior to 442ec4c04d ("PCI: dwc: all: Split struct pcie_port into
host-only and core structures"), every driver had a struct pcie_host_ops
with function pointers, typically used as:

  if (pp->ops->readl_rc)
    return pp->ops->readl_rc(...);

442ec4c04d split struct pcie_host_ops into two pieces: struct
dw_pcie_host_ops and struct dw_pcie_ops, so the above became:

  if (pci->ops->readl_dbi)
    return pci->ops->readl_dbi(...);

But pcie-artpec6.c and pcie-designware-plat.c don't need the dw_pcie_ops
pointers and didn't supply a pci->ops struct, which leads to NULL pointer
dereferences.

Supply an empty struct dw_pcie_ops to avoid the NULL pointer dereferences.

[bhelgaas: changelog]
Fixes: 442ec4c04d ("PCI: dwc: all: Split struct pcie_port into host-only and core structures")
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
This commit is contained in:
Niklas Cassel 2017-04-03 17:35:12 -05:00 committed by Bjorn Helgaas
parent 6665f8a307
commit 794a8604fe
2 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/pci/dwc/pcie-artpec6.c
View File

@ -234,6 +234,9 @@ static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
return 0;
}
static const struct dw_pcie_ops dw_pcie_ops = {
};
static int artpec6_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -252,6 +255,7 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
return -ENOMEM;
pci->dev = dev;
pci->ops = &dw_pcie_ops;
artpec6_pcie->pci = pci;

4
drivers/pci/dwc/pcie-designware-plat.c
View File

@ -86,6 +86,9 @@ static int dw_plat_add_pcie_port(struct pcie_port *pp,
return 0;
}
static const struct dw_pcie_ops dw_pcie_ops = {
};
static int dw_plat_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -103,6 +106,7 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
return -ENOMEM;
pci->dev = dev;
pci->ops = &dw_pcie_ops;
dw_plat_pcie->pci = pci;