linux-kernel - Re: [PATCH v5 10/10] x86, efi: EFI boot stub support

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Message-ID: <1318876097.23581.125.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Mon, 17 Oct 2011 19:28:17 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Maarten Lankhorst <m.b.lankhorst@...il.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Mike Waychison <mikew@...gle.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v5 10/10] x86, efi: EFI boot stub support

On Mon, 2011-10-17 at 18:39 +0200, Maarten Lankhorst wrote:
> > +		if (options_size) {
> > +			if (options_size > hdr->cmdline_size)
> > +				options_size = hdr->cmdline_size;
> > +
> > +			options_size++;	/* NUL termination */
> > +
> > +			status = low_alloc(options_size, 1, &cmdline);
> > +			if (status != EFI_SUCCESS)
> > +				goto fail;
> Shouldn't this be options_size + 1?

Nope. Notice the options_size++ above the allocation.

> > +
> > +			s1 = (u8 *)(unsigned long)cmdline;
> > +			s2 = (u16 *)options;
> > +
> > +			for (i = 0; i < options_size - 1; i++)
> > +				*s1++ = *s2++;

And the options_size - 1 here.

> > +
> > +			*s1 = '\0';
> For this null character..

So this should all work OK.

-- 
Matt Fleming, Intel Open Source Technology Center

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