* [PATCH] pinctrl: berlin: Fix to avoid NULL pointer dereference
@ 2019-03-18 23:31 Aditya Pakki
2019-03-19 5:29 ` Jisheng Zhang
0 siblings, 1 reply; 2+ messages in thread
From: Aditya Pakki @ 2019-03-18 23:31 UTC (permalink / raw)
To: pakki001; +Cc: kjlu, Linus Walleij, Jisheng Zhang, linux-gpio, linux-kernel
of_match_device can return a NULL value when the matching device is
not found. The patch avoids a potential dereference in such scenario.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
drivers/pinctrl/berlin/berlin-bg4ct.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/pinctrl/berlin/berlin-bg4ct.c b/drivers/pinctrl/berlin/berlin-bg4ct.c
index 6a7fe929a68b..2d5e82938ef9 100644
--- a/drivers/pinctrl/berlin/berlin-bg4ct.c
+++ b/drivers/pinctrl/berlin/berlin-bg4ct.c
@@ -456,6 +456,9 @@ static int berlin4ct_pinctrl_probe(struct platform_device *pdev)
struct resource *res;
void __iomem *base;
+ if (!match)
+ return -ENODEV;
+
rmconfig = devm_kzalloc(&pdev->dev, sizeof(*rmconfig), GFP_KERNEL);
if (!rmconfig)
return -ENOMEM;
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] pinctrl: berlin: Fix to avoid NULL pointer dereference
2019-03-18 23:31 [PATCH] pinctrl: berlin: Fix to avoid NULL pointer dereference Aditya Pakki
@ 2019-03-19 5:29 ` Jisheng Zhang
0 siblings, 0 replies; 2+ messages in thread
From: Jisheng Zhang @ 2019-03-19 5:29 UTC (permalink / raw)
To: Aditya Pakki
Cc: kjlu@umn.edu, Linus Walleij, linux-gpio@vger.kernel.org,
linux-kernel@vger.kernel.org
On Mon, 18 Mar 2019 18:31:29 -0500 Aditya Pakki wrote:
>
>
> of_match_device can return a NULL value when the matching device is
This could not happen. If the probe is called, it means OF registered a
device with a valid compatible string, so match cannot be NULL.
> not found. The patch avoids a potential dereference in such scenario.
>
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
> ---
> drivers/pinctrl/berlin/berlin-bg4ct.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pinctrl/berlin/berlin-bg4ct.c b/drivers/pinctrl/berlin/berlin-bg4ct.c
> index 6a7fe929a68b..2d5e82938ef9 100644
> --- a/drivers/pinctrl/berlin/berlin-bg4ct.c
> +++ b/drivers/pinctrl/berlin/berlin-bg4ct.c
> @@ -456,6 +456,9 @@ static int berlin4ct_pinctrl_probe(struct platform_device *pdev)
> struct resource *res;
> void __iomem *base;
>
> + if (!match)
> + return -ENODEV;
> +
> rmconfig = devm_kzalloc(&pdev->dev, sizeof(*rmconfig), GFP_KERNEL);
> if (!rmconfig)
> return -ENOMEM;
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-03-19 5:29 ` Jisheng Zhang
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