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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Message-Id: <20091009142742.b12b80b1.randy.dunlap@oracle.com>
Date:	Fri, 9 Oct 2009 14:27:42 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Bruce Beare <bbeare1@...il.com>, 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

On Fri, 9 Oct 2009 14:16:10 -0700 Greg KH wrote:

> 
> 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);

The new struct already includes the [32]s.


> 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?

yep.

---
~Randy
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