linux-kernel - Re: [PATCH] Cleanups for: line length, printk KERN_ argument, stack frame size > 2048 (added a kmalloc/kfree), style/formatting errors, incorrect include files

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Date:	Fri, 9 Oct 2009 14:16:10 -0700
From:	Greg KH <gregkh@...e.de>
To:	Bruce Beare <bbeare1@...il.com>
Cc:	Bill Pemberton <wfp5p@...ginia.edu>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Cleanups for: line length, printk KERN_ argument,
 stack frame size > 2048 (added a kmalloc/kfree), style/formatting errors,
 incorrect include files


Try changing one thing at a time per patch please.

There's some bugs in here:

> -		struct config_t dig_in_config[32];
> -		struct config_t dig_out_config[32];
> -		struct config_t chan_in_config[32];
> -		struct config_t chan_out_config[32];
>  		int i;
> +		config_data = kmalloc(sizeof(struct config_data_t), GFP_KERNEL);

Shouldn't that be:
		config_data = kmalloc(sizeof(struct config_data_t)*32, GFP_KERNEL);

Otherwise you overflow your buffer here:
>  
>  		for (i = 0; i < 32; i++) {
> -			dig_in_config[i].kind = 0;
> -			dig_in_config[i].bits = 0;
> -			dig_in_config[i].min = 0;
> -			dig_in_config[i].max = 0;
> -			dig_out_config[i].kind = 0;
> -			dig_out_config[i].bits = 0;
> -			dig_out_config[i].min = 0;
> -			dig_out_config[i].max = 0;
> -			chan_in_config[i].kind = 0;
> -			chan_in_config[i].bits = 0;
> -			chan_in_config[i].min = 0;
> -			chan_in_config[i].max = 0;
> -			chan_out_config[i].kind = 0;
> -			chan_out_config[i].bits = 0;
> -			chan_out_config[i].min = 0;
> -			chan_out_config[i].max = 0;
> +			config_data->dig_in_config[i].kind = 0;
> +			config_data->dig_in_config[i].bits = 0;
> +			config_data->dig_in_config[i].min = 0;
> +			config_data->dig_in_config[i].max = 0;
> +			config_data->dig_out_config[i].kind = 0;
> +			config_data->dig_out_config[i].bits = 0;
> +			config_data->dig_out_config[i].min = 0;
> +			config_data->dig_out_config[i].max = 0;
> +			config_data->chan_in_config[i].kind = 0;
> +			config_data->chan_in_config[i].bits = 0;
> +			config_data->chan_in_config[i].min = 0;
> +			config_data->chan_in_config[i].max = 0;
> +			config_data->chan_out_config[i].kind = 0;
> +			config_data->chan_out_config[i].bits = 0;
> +			config_data->chan_out_config[i].min = 0;
> +			config_data->chan_out_config[i].max = 0;
>  		}

Or am I mistaken?

thanks,

greg k-h
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