linux-kernel - Re: [PATCH 1/4] uprobes: Fix dentry/mount leak in create_trace

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Message-ID: <20130128120859.GB29865@linux.vnet.ibm.com>
Date:	Mon, 28 Jan 2013 17:38:59 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Anton Arapov <anton@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Josh Stone <jistone@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] uprobes: Fix dentry/mount leak in
 create_trace_uprobe()

* Oleg Nesterov <oleg@...hat.com> [2013-01-27 20:48:33]:

> create_trace_uprobe() does kern_path() to find ->d_inode, but forgets
> to do path_put(). We can do this right after igrab().
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
>  kernel/trace/trace_uprobe.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index f3fd8ff..53afabe 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -255,12 +255,13 @@ static int create_trace_uprobe(int argc, char **argv)
>  	if (ret)
>  		goto fail_address_parse;
> 
> +	inode = igrab(path.dentry->d_inode);
> +	path_put(&path);
> +
>  	ret = kstrtoul(arg, 0, &offset);
>  	if (ret)
>  		goto fail_address_parse;
> 
> -	inode = igrab(path.dentry->d_inode);
> -
>  	argc -= 2;
>  	argv += 2;
> 
> -- 
> 1.5.5.1
> 

-- 
Thanks and Regards
Srikar Dronamraju

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