linux-kernel - Re: [PATCH] drivers: watchdog: exar

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Date:   Thu, 13 Oct 2022 06:53:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Manank Patel <pmanank200502@...il.com>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: watchdog: exar_wdt.c fix use after free

On 10/13/22 02:54, Manank Patel wrote:
> fix use after free by storing the result of PTR_ERR(n->pdev)
> to a local variable before returning.
> 
> Signed-off-by: Manank Patel <pmanank200502@...il.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/exar_wdt.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/exar_wdt.c b/drivers/watchdog/exar_wdt.c
> index 35058d8b21bc..7c61ff343271 100644
> --- a/drivers/watchdog/exar_wdt.c
> +++ b/drivers/watchdog/exar_wdt.c
> @@ -355,8 +355,10 @@ static int __init exar_wdt_register(struct wdt_priv *priv, const int idx)
>   						    &priv->wdt_res, 1,
>   						    priv, sizeof(*priv));
>   	if (IS_ERR(n->pdev)) {
> +		int err = PTR_ERR(n->pdev);
> +
>   		kfree(n);
> -		return PTR_ERR(n->pdev);
> +		return err;
>   	}
>   
>   	list_add_tail(&n->list, &pdev_list);