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

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Date:	Mon, 14 Feb 2011 23:14:27 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Willy Tarreau <w@....eu>
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

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!

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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