Hi Shailendra,
On Mon, Jan 30, 2017 at 10:19:35AM +0530, Shailendra Verma wrote:
> of_match_device could return NULL, and so can cause a NULL
> pointer dereference later.
>
> Signed-off-by: Shailendra Verma <shailendra.v@xxxxxxxxxxx>
> ---
> drivers/pci/host/pcie-hisi.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/host/pcie-hisi.c b/drivers/pci/host/pcie-hisi.c
> index 56154c2..3256f8f 100644
> --- a/drivers/pci/host/pcie-hisi.c
> +++ b/drivers/pci/host/pcie-hisi.c
> @@ -174,6 +174,10 @@ static int hisi_pcie_probe(struct platform_device *pdev)
> driver = dev->driver;
>
> match = of_match_device(driver->of_match_table, dev);
> + if (!match) {
> + dev_err(dev, "Error: No device match found\n");
> + return -ENODEV;
> + }
> hisi_pcie->soc_ops = (struct pcie_soc_ops *) match->data;
>
> hisi_pcie->subctrl =
I like this patch and I think it's correct. I'd like an ack from Zhou
and/or Gabriele, and I'd propose the following tweak, which just moves the
check earlier, before we start allocating this:
commit 0bd4137b946cab412d612ae155f3b268f2f0a856
Author: Shailendra Verma <shailendra.v@xxxxxxxxxxx>
Date: Mon Jan 30 10:19:35 2017 +0530
PCI: hisi: Check of_match_device() return value
of_match_device() could return NULL, and so can cause a NULL pointer
dereference later. Check the result first, before we start setting up
things that need to be undone if it fails.
[bhelgaas: check earlier, changelog]
Signed-off-by: Shailendra Verma <shailendra.v@xxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
diff --git a/drivers/pci/host/pcie-hisi.c b/drivers/pci/host/pcie-hisi.c
index a301a7187b30..0f0521169a3c 100644
--- a/drivers/pci/host/pcie-hisi.c
+++ b/drivers/pci/host/pcie-hisi.c
@@ -264,6 +264,10 @@ static int hisi_pcie_probe(struct platform_device *pdev)
struct device_driver *driver;
int ret;
+ match = of_match_device(driver->of_match_table, dev);
+ if (!match)
+ return -ENODEV;
+
hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL);
if (!hisi_pcie)
return -ENOMEM;
@@ -272,7 +276,6 @@ static int hisi_pcie_probe(struct platform_device *pdev)
pp->dev = dev;
driver = dev->driver;
- match = of_match_device(driver->of_match_table, dev);
hisi_pcie->soc_ops = (struct pcie_soc_ops *) match->data;
hisi_pcie->subctrl =
--
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