linux-kernel - Re: [PATCH] nvmem: nintendo-otp: Fix potential NULL pointer dereference in nintendo_otp

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Message-ID: <f23a8d2c-7bfc-4a07-9f18-45c9c3b18834@kernel.org>
Date: Mon, 5 Jan 2026 07:59:13 +0000
From: Srinivas Kandagatla <srini@...nel.org>
To: Haotian Zhang <vulab@...as.ac.cn>, srini@...nel.org
Cc: linkmauve@...kmauve.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvmem: nintendo-otp: Fix potential NULL pointer
 dereference in nintendo_otp_probe()



On 12/10/25 3:38 AM, Haotian Zhang wrote:
> of_match_device() may return NULL if no match is found.
> Dereferencing the return value of_id in nintendo_otp_probe()
This does not make sense, nintendo_otp_probe() will never be called
without a dt compatible match.

Why do you think this will be null?

--srini

> 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@...as.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;