linux-kernel - Re: [PATCH] ti-st: handle null allocation return correctly.

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Message-ID: <20150512210211.GB10039@kroah.com>
Date:	Tue, 12 May 2015 14:02:11 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Colin King <colin.king@...onical.com>
Cc:	Gigi Joseph <gigi.joseph@...il.com>, Eyal Reizer <eyalr@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ti-st: handle null allocation return correctly.

On Tue, May 12, 2015 at 07:23:03PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> static analysis with smatch picked up the following error:
> 
> get_platform_data() error: potential null dereference 'dt_pdata'.
>   (kzalloc returns null)
> 
> ironically, the code already checks for a null kzalloc return and
> emits an error message.  Fix by adding an error return of NULL rather
> than continuing and tripping the null dereference.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/misc/ti-st/st_kim.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
> index 18e7a03..5a5265a 100644
> --- a/drivers/misc/ti-st/st_kim.c
> +++ b/drivers/misc/ti-st/st_kim.c
> @@ -753,8 +753,10 @@ static struct ti_st_plat_data *get_platform_data(struct device *dev)
>  
>  	dt_pdata = kzalloc(sizeof(*dt_pdata), GFP_KERNEL);
>  
> -	if (!dt_pdata)
> +	if (!dt_pdata) {
>  		pr_err("Can't allocate device_tree platform data\n");

Care to remove this as well?  It's not needed.

thanks,

greg k-h
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