of_match_device() may return NULL if no match is found.
Dereferencing the return value of_id in nintendo_otp_probe()
without a check could lead to a NULL pointer dereference.

Add a check for of_id and return -ENODEV upon failure.

Fixes: 3683b761fe3a ("nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
---
 drivers/nvmem/nintendo-otp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nvmem/nintendo-otp.c b/drivers/nvmem/nintendo-otp.c
index 355e7f1fc6d5..89b15a58bf88 100644
--- a/drivers/nvmem/nintendo-otp.c
+++ b/drivers/nvmem/nintendo-otp.c
@@ -87,6 +87,9 @@ static int nintendo_otp_probe(struct platform_device *pdev)
 		.root_only = true,
 	};
 
+	if (!of_id)
+		return -ENODEV;
+
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.50.1.windows.1

Hi,

On Wed, Dec 10, 2025 at 11:38:03AM +0800, Haotian Zhang wrote:
> of_match_device() may return NULL if no match is found.
> Dereferencing the return value of_id in nintendo_otp_probe()
> without a check could lead to a NULL pointer dereference.
> 
> Add a check for of_id and return -ENODEV upon failure.
> 
> Fixes: 3683b761fe3a ("nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP")
> Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
> ---
>  drivers/nvmem/nintendo-otp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/nvmem/nintendo-otp.c b/drivers/nvmem/nintendo-otp.c
> index 355e7f1fc6d5..89b15a58bf88 100644
> --- a/drivers/nvmem/nintendo-otp.c
> +++ b/drivers/nvmem/nintendo-otp.c
> @@ -87,6 +87,9 @@ static int nintendo_otp_probe(struct platform_device *pdev)
>  		.root_only = true,
>  	};
>  
> +	if (!of_id)
> +		return -ENODEV;
> +
>  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>  	if (!priv)
>  		return -ENOMEM;
> -- 
> 2.50.1.windows.1
> 

Thank you for that, this patch is:
Reviewed-by: Link Mauve <kernel@linkmauve.fr>

-- 
Link Mauve