linux-kernel - Re: [PATCH AUTOSEL 4.9 1/8] of/fdt: Don't calculate initrd size from DT if start

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Message-ID: <20221018093725.GC1264@duo.ucw.cz>
Date:   Tue, 18 Oct 2022 11:37:25 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Marek Bykowski <marek.bykowski@...il.com>,
        Rob Herring <robh@...nel.org>, robh+dt@...nel.org,
        frowand.list@...il.com, devicetree@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.9 1/8] of/fdt: Don't calculate initrd size from
 DT if start > end

Hi!

> It should be stressed, it is generally a fault of the bootloader's with
> the kernel relying on it, however we should not allow the bootloader's
> misconfiguration to lead to the kernel oops. Not only the kernel
> should be

I believe we should at least printk() if we detect bootloader bug of
this severity.

Best regards,
								Pavel


> +++ b/drivers/of/fdt.c
> @@ -917,6 +917,8 @@ static void __init early_init_dt_check_for_initrd(unsigned long node)
>  	if (!prop)
>  		return;
>  	end = of_read_number(prop, len/4);
> +	if (start > end)
> +		return;
>  
>  	__early_init_dt_declare_initrd(start, end);
>  
> -- 
> 2.35.1

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HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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