linux-kernel - Re: [PATCH 4/7] arm64/efi: uefi

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Message-ID: <20140815150544.GX27466@arm.com>
Date:	Fri, 15 Aug 2014 16:05:44 +0100
From:	Will Deacon <will.deacon@....com>
To:	Dave Young <dyoung@...hat.com>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"msalter@...hat.com" <msalter@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH 4/7] arm64/efi: uefi_init error handling fix

On Thu, Aug 14, 2014 at 10:15:29AM +0100, Dave Young wrote:
> There's one early memmap leak in uefi_init error path, fix it and slightly tune
> the error handling code.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>

Reported-by: Will Deacon <will.deacon@....com>
Acked-by: Will Deacon <will.deacon@....com>

Thanks for fixing this.

Will

> ---
>  arch/arm64/kernel/efi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
> index e72f310..6ed0362 100644
> --- a/arch/arm64/kernel/efi.c
> +++ b/arch/arm64/kernel/efi.c
> @@ -89,7 +89,8 @@ static int __init uefi_init(void)
>  	 */
>  	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
>  		pr_err("System table signature incorrect\n");
> -		return -EINVAL;
> +		retval = -EINVAL;
> +		goto out;
>  	}
>  	if ((efi.systab->hdr.revision >> 16) < 2)
>  		pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
> @@ -103,6 +104,7 @@ static int __init uefi_init(void)
>  		for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
>  			vendor[i] = c16[i];
>  		vendor[i] = '\0';
> +		early_memunmap(c16, sizeof(vendor));
>  	}
>  
>  	pr_info("EFI v%u.%.02u by %s\n",
> @@ -113,9 +115,8 @@ static int __init uefi_init(void)
>  	if (retval == 0)
>  		set_bit(EFI_CONFIG_TABLES, &efi.flags);
>  
> -	early_memunmap(c16, sizeof(vendor));
> +out:
>  	early_memunmap(efi.systab,  sizeof(efi_system_table_t));
> -
>  	return retval;
>  }
>  
> -- 
> 1.8.3.1
> 
> 
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