linux-kernel - Re: [PATCH 1/2] cxl/hdm: Fix && vs || bug

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Date:   Tue, 31 Oct 2023 12:02:43 +0100
From:   Robert Richter <rrichter@....com>
To:     Dan Carpenter <dan.carpenter@...aro.org>
Cc:     Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Terry Bowman <terry.bowman@....com>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] cxl/hdm: Fix && vs || bug

On 31.10.23 12:53:52, Dan Carpenter wrote:
> If "info" is NULL then this code will crash.  || was intended instead of
> &&.
> 
> Fixes: 8ce520fdea24 ("cxl/hdm: Use stored Component Register mappings to map HDM decoder capability")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  drivers/cxl/core/hdm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
> index bc8ad4a8afca..af17da8230d5 100644
> --- a/drivers/cxl/core/hdm.c
> +++ b/drivers/cxl/core/hdm.c
> @@ -146,7 +146,7 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
>  
>  	/* Memory devices can configure device HDM using DVSEC range regs. */
>  	if (reg_map->resource == CXL_RESOURCE_NONE) {
> -		if (!info && !info->mem_enabled) {
> +		if (!info || !info->mem_enabled) {

Right, there was a bug.

Reviewed-by: Robert Richter <rrichter@....com>

>  			dev_err(dev, "No component registers mapped\n");
>  			return ERR_PTR(-ENXIO);
>  		}
> -- 
> 2.42.0
>