linux-kernel - Re: [PATCH] phy: sunplus: Fix a memory leak in update_disc

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Date: Tue, 30 Jan 2024 22:40:21 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Vincent Shih <vincent.sunplus@...il.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH] phy: sunplus: Fix a memory leak in update_disc_vol()

On 28-01-24, 09:47, Christophe JAILLET wrote:
> 'otp_v', allocated by nvmem_cell_read(), is leaking.
> It must be freed before leaving the function to avoid a leak.
> 
> Fixes: 99d9ccd97385 ("phy: usb: Add USB2.0 phy driver for Sunplus SP7021")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch is speculative and based on comparison on the usage of
> nvmem_cell_read() in other driver.
> 
> Review with care.
> ---
>  drivers/phy/sunplus/phy-sunplus-usb2.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
> index 637a5fbae6d9..50f1f91ac052 100644
> --- a/drivers/phy/sunplus/phy-sunplus-usb2.c
> +++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
> @@ -105,6 +105,8 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
>  	val = (val & ~J_DISC) | set;
>  	writel(val, usbphy->phy_regs + CONFIG7);
>  
> +	kfree(otp_v);

Looking at documentation, this should be nvmem_cell_put() see:
Documentation/driver-api/nvmem.rst

What do you suggest Srini?

> +
>  	return 0;
>  }
>  
> -- 
> 2.43.0

-- 
~Vinod