netdev - Re: [PATCH] net: wireless: fix missing checks for ioremap

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Date:   Fri, 22 Mar 2019 22:58:30 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: wireless: fix missing checks for ioremap


Can someone review the patch?

Thanks.

> On Mar 11, 2019, at 2:54 AM, Kangjie Lu <kjlu@....edu> wrote:
> 
> ioremap could fail and returns NULL. The fix actively checks
> its return value and handles potential failures.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
> drivers/net/wireless/ray_cs.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
> index 44a943d18b84..cecd18a2f2de 100644
> --- a/drivers/net/wireless/ray_cs.c
> +++ b/drivers/net/wireless/ray_cs.c
> @@ -394,6 +394,10 @@ static int ray_config(struct pcmcia_device *link)
> 		goto failed;
> 	local->sram = ioremap(link->resource[2]->start,
> 			resource_size(link->resource[2]));
> +	if (!local->sram) {
> +		ret = -ENOMEM;
> +		goto failed;
> +	}
> 
> /*** Set up 16k window for shared memory (receive buffer) ***************/
> 	link->resource[3]->flags |=
> @@ -408,6 +412,10 @@ static int ray_config(struct pcmcia_device *link)
> 		goto failed;
> 	local->rmem = ioremap(link->resource[3]->start,
> 			resource_size(link->resource[3]));
> +	if (!local->rmem) {
> +		ret = -ENOMEM;
> +		goto failed;
> +	}
> 
> /*** Set up window for attribute memory ***********************************/
> 	link->resource[4]->flags |=
> @@ -422,6 +430,10 @@ static int ray_config(struct pcmcia_device *link)
> 		goto failed;
> 	local->amem = ioremap(link->resource[4]->start,
> 			resource_size(link->resource[4]));
> +	if (!local->amem) {
> +		ret = -ENOMEM;
> +		goto failed;
> +	}
> 
> 	dev_dbg(&link->dev, "ray_config sram=%p\n", local->sram);
> 	dev_dbg(&link->dev, "ray_config rmem=%p\n", local->rmem);
> -- 
> 2.17.1
>