[PATCH] PCI: Fix to avoid potential NULL pointer dereference

[PATCH] PCI: Fix to avoid potential NULL pointer dereference

[Aditya Pakki]

In gen_pci_probe, of_match_node can return a NULL pointer in case of
failure. The patch avoids a NULL pointer dereference in such a scenario.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
 drivers/pci/controller/pci-host-generic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/pci-host-generic.c b/drivers/pci/controller/pci-host-generic.c
index dea3ec7592a2..85f473f50e96 100644
--- a/drivers/pci/controller/pci-host-generic.c
+++ b/drivers/pci/controller/pci-host-generic.c
@@ -83,6 +83,8 @@ static int gen_pci_probe(struct platform_device *pdev)
 	struct pci_ecam_ops *ops;
 
 	of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
+	if (!of_id)
+		return -ENXIO;
 	ops = (struct pci_ecam_ops *)of_id->data;
 
 	return pci_host_common_probe(pdev, ops);
-- 
2.17.1


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Re: [PATCH] PCI: Fix to avoid potential NULL pointer dereference

[Jisheng Zhang]

On Mon, 18 Mar 2019 19:26:30 -0500 Aditya Pakki wrote:

> 
> In gen_pci_probe, of_match_node can return a NULL pointer in case of

This could not happen. If the probe is called, it means OF registered a
device with a valid compatible string, so of_match_node cannot be NULL.

> failure. The patch avoids a NULL pointer dereference in such a scenario.
> 
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
> ---
>  drivers/pci/controller/pci-host-generic.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/controller/pci-host-generic.c b/drivers/pci/controller/pci-host-generic.c
> index dea3ec7592a2..85f473f50e96 100644
> --- a/drivers/pci/controller/pci-host-generic.c
> +++ b/drivers/pci/controller/pci-host-generic.c
> @@ -83,6 +83,8 @@ static int gen_pci_probe(struct platform_device *pdev)
>         struct pci_ecam_ops *ops;
> 
>         of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);
> +       if (!of_id)
> +               return -ENXIO;
>         ops = (struct pci_ecam_ops *)of_id->data;
> 
>         return pci_host_common_probe(pdev, ops);
> --
> 2.17.1
> 
> 
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