linux-kernel - Re: [PATCH v2] bus: imx-weim: fix branch condition evaluates to a garbage value

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Message-ID: <20230313061030.jdo5w6fs5cu33txm@x260>
Date:   Mon, 13 Mar 2023 09:10:30 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     linux-imx@....com
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] bus: imx-weim: fix branch condition evaluates to a
 garbage value

On Mon, Mar 06, 2023 at 04:25:26PM +0300, Ivan Bornyakov wrote:
> If bus type is other than imx50_weim_devtype and have no child devices,
> variable 'ret' in function weim_parse_dt() will not be initialized, but
> will be used as branch condition and return value. Fix this by
> initializing 'ret' with 0.
> 
> This was discovered with help of clang-analyzer, but the situation is
> quite possible in real life.
> 
> Fixes: 52c47b63412b ("bus: imx-weim: improve error handling upon child probe-failure")
> Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
> Cc: stable@...r.kernel.org
> Reviewed-by: Fabio Estevam <festevam@...il.com>
> ---
>  drivers/bus/imx-weim.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> ChangeLog:
>   v1:
> [https://lore.kernel.org/all/20230306060505.11657-1-i.bornyakov@metrotek.ru/]
>   v2:
>     * add "Fixes" tag
>     * add Fabio's "Reviewed-by" tag
> 
> diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
> index 828c66bbaa67..55d917bd1f3f 100644
> --- a/drivers/bus/imx-weim.c
> +++ b/drivers/bus/imx-weim.c
> @@ -204,8 +204,8 @@ static int weim_parse_dt(struct platform_device *pdev)
>  	const struct of_device_id *of_id = of_match_device(weim_id_table,
>  							   &pdev->dev);
>  	const struct imx_weim_devtype *devtype = of_id->data;
> +	int ret = 0, have_child = 0;
>  	struct device_node *child;
> -	int ret, have_child = 0;
>  	struct weim_priv *priv;
>  	void __iomem *base;
>  	u32 reg;
> -- 
> 2.39.2
> 

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