linux-kernel - Re: [PATCH 1/4] printk: Allocate kernel log buffer earlier

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Message-ID: <20110228080642.GC1600@elte.hu>
Date:	Mon, 28 Feb 2011 09:06:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Mike Travis <travis@....com>, David Rientjes <rientjes@...gle.com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Len Brown <len.brown@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yhlu.kernel@...il.com>, linux-acpi@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/4] printk: Allocate kernel log buffer earlier


* Yinghai Lu <yinghai@...nel.org> wrote:

> +	new_addr = memblock_alloc(new_log_buf_len, PAGE_SIZE);
> +	if (new_addr != MEMBLOCK_ERROR)
> +		new_log_buf = __va(new_addr);
> +	else
> +		new_log_buf = alloc_bootmem(new_log_buf_len);

alloc_bootmem() can fail, especially if someone uses a too large boot parameter 
value - and your code does not check for failure.

Thanks,

	Ingo
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