linux-kernel - Re: [PATCH] autofs4 - panic after mount fail

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Date:	Mon, 13 Nov 2006 23:51:22 +0800
From:	Ian Kent <raven@...maw.net>
To:	David Howells <dhowells@...hat.com>
Cc:	Andrew Morton <akpm@...l.org>, "bibo,mao" <bibo.mao@...el.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] autofs4 - panic after mount fail

On Mon, 2006-11-13 at 11:07 +0000, David Howells wrote:
> Ian Kent <raven@...maw.net> wrote:
> 
> > -	if (sbi->pipe) {
> > -		fput(sbi->pipe);	/* Close the pipe */
> > -		sbi->pipe = NULL;
> > -	}
> > +	fput(sbi->pipe);	/* Close the pipe */
> > +	sbi->pipe = NULL;
> 
> Ummm...  Is that right?  fput() doesn't check its argument for a NULL pointer,
> so the original code shouldn't hurt and should give you an extra bit of
> defense.

HaHa .. sometimes it's people saying "get id of that you don't need it"
and other times it's the opposite.

Setting sbi->catatonic = 1 upon entry to autofs[4]_fill_super ensures
that autofs[4]_catatonic_mode is not called until after sbi->pipe is non
NULL. So I decided, in this case, to remove the test.

Ian


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