linux-kernel - Re: [patch v2] x86, efi: fix pointer math issue in handle

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Date:	Mon, 05 Mar 2012 11:33:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	wharms@....de
CC:	Dan Carpenter <dan.carpenter@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] x86, efi: fix pointer math issue in handle_ramdisks()

On 03/05/2012 10:42 AM, walter harms wrote:
> 
> 
> Am 05.03.2012 19:06, schrieb Dan Carpenter:
>> "filename" is a efi_char16_t string so this check for reaching the end
>> of the array doesn't work.  We need to cast the pointer to (u8 *) before
>> doing the math.
>>
>> This patch changes the "filename" to "filename_16" to avoid confusion in
>> the future.
>>
> 
> maybe it is a bit late,  but ...
> is efi_char16_t a generic requirement for EFI ? perhaps we can use wchar_t
> since it is intended for such cases. additional we would get an api for free.
> 

wchar_t is typically 32 bits on Linux.  16-bit anything is a major fail
since Unicode doesn't actually fit in 16 bits.

	-hpa

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