linux-kernel - Re: [PATCH] drivers/usb/gadget/inode.c: add missing kfree

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Message-ID: <Pine.LNX.4.44L0.1106021035500.1913-100000@iolanthe.rowland.org>
Date:	Thu, 2 Jun 2011 10:53:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Julia Lawall <julia@...u.dk>
cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	<kernel-janitors@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/usb/gadget/inode.c: add missing kfree

On Thu, 2 Jun 2011, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> The label fail frees dev->buf, but kbuf hasn't yet been stored there at
> this point.

...

> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
> I wonder if it is really correct to free dev->buf at fail in this case.
> Because it is freeing the previously allocated value of dev->buf, not the
> current one as done in subsequent cases.

I don't think it matters.  This check is probably there only for 
safety; it should not be possible for dev->buf to be non-NULL at this 
point.  You ought to be able to remove the entire

	if (dev->buf)
		goto fail;

statement with no ill effects.

Alan Stern

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