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Date: Mon, 10 Jun 2013 14:13:50 -0700
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Li Zefan <lizefan@huawei.com>
Cc: Namhyung Kim <namhyung@kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	stable <stable@vger.kernel.org>
Subject: Re: [PATCH 3.0-stable 1/2] tracing: Fix possible NULL pointer
 dereferences
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References: <51B1A131.9090206@huawei.com>
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On Fri, Jun 07, 2013 at 05:00:33PM +0800, Li Zefan wrote:
> commit 6a76f8c0ab19f215af2a3442870eeb5f0e81998d upstream.
> 
> Currently set_ftrace_pid and set_graph_function files use seq_lseek
> for their fops.  However seq_open() is called only for FMODE_READ in
> the fops->open() so that if an user tries to seek one of those file
> when she open it for writing, it sees NULL seq_file and then panic.

You lost the original authorship of this patch, which is a very bad
thing to do.

Ugh, time to edit emails by hand, not my favorite pasttime, someone owes
me a drink...

greg k-h