linux-kernel - Re: [PATCH 3.0-stable 1/2] tracing: Fix possible NULL pointer dereferences

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Date:	Mon, 10 Jun 2013 14:13:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH 3.0-stable 1/2] tracing: Fix possible NULL pointer
 dereferences

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
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