linux-kernel - Re: [PATCH] acpi: debugfs: fix buffer overflows, double free

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Message-ID: <ihbepu$jbj$2@dough.gmane.org>
Date:	Fri, 21 Jan 2011 08:06:22 +0000 (UTC)
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acpi: debugfs: fix buffer overflows, double free

On Thu, 20 Jan 2011 23:08:06 +0300, Vasiliy Kulikov wrote:

> File position is not controlled, it may lead to overwrites of arbitrary
> kernel memory.  Also the code may kfree() the same pointer multiple
> times.
> 
> One more flaw is still present: if multiple processes open the file then
> all 3 static variables are shared, leading to various race conditions.
> They should be moved to file->private_data.
> 
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>

Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>

Thanks.

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