linux-kernel - Re: [Stable-review] [PATCH 20/23] tracing: Fix panic when lseek() called on "trace" opened for writing

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Message-ID: <20110215053922.GB17278@1wt.eu>
Date:	Tue, 15 Feb 2011 06:39:22 +0100
From:	Willy Tarreau <w@....eu>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, Slava Pestov <slavapestov@...gle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [Stable-review] [PATCH 20/23] tracing: Fix panic when lseek() called on "trace" opened for writing

Hi Ben,

On Mon, Feb 14, 2011 at 11:14:27PM +0000, Ben Hutchings wrote:
> On Mon, 2011-02-07 at 00:23 +0100, Willy Tarreau wrote:
> > 2.6.27.58-stable review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > 
> > From: Slava Pestov <slavapestov@...gle.com>
> > 
> > commit 364829b1263b44aa60383824e4c1289d83d78ca7 upstream.
> > 
> > The file_ops struct for the "trace" special file defined llseek as seq_lseek().
> > However, if the file was opened for writing only, seq_open() was not called,
> > and the seek would dereference a null pointer, file->private_data.
> > 
> > This patch introduces a new wrapper for seq_lseek() which checks if the file
> > descriptor is opened for reading first. If not, it does nothing.
> [...]
> > --- longterm-2.6.27.orig/kernel/trace/trace.c	2011-01-23 10:52:37.000000000 +0100
> > +++ longterm-2.6.27/kernel/trace/trace.c	2011-01-29 11:42:07.287067215 +0100
> > @@ -2041,17 +2041,25 @@
> >  	return ret;
> >  }
> >  
> > +static loff_t tracing_seek(struct file *file, loff_t offset, int origin)
> [...]
> > +	.llseek		= tracing_lseek,
> [...]
> > +	.llseek		= tracing_lseek,
> [...]
> 
> These names don't agree!

Indeed, it's been fixed before releasing.
Thanks for the review anyway !

Willy

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