linux-ext4 - Re: [v2] ext4: fix possible non-initialized variable

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Message-ID: <20120917182604.GA1959@andromeda.usersys.redhat.com>
Date:	Mon, 17 Sep 2012 15:26:04 -0300
From:	Carlos Maiolino <cmaiolino@...hat.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: [v2] ext4: fix possible non-initialized variable

On Mon, Sep 17, 2012 at 11:37:01AM -0400, Theodore Ts'o wrote:
> On Mon, Sep 17, 2012 at 10:30:46AM -0500, Eric Sandeen wrote:
> > fwiw, the uninit variable came about as part of
> > 2ed886852adfcb070bf350e66a0da0d98b2f3ab5; before that we happily
> > returned 0 for an unmapped block; see below.  So unless something
> > else has changed since then, Carlos' patch shouldn't be doing any
> > harm, at least.  An audit may be in order but anyone
> > misunderstanding a NULL/0 return has probably been that way for a
> > while.
> 
> Hmm, good point.
> 
> This is an audit that needs to happen for ext3 and ext4 as well, BTW
> --- the callers of ext3_getblk() don't do the right thing when
> ext3_getblk returns NULL and sets *errp to zero.
> 
> Fortunately it's rare that we have directories with holes, but there
> are definitely bugs in terms of undefined behavior in the case of
> directories with holes that we should look at and fix.
> 
> 	    	       	       	      	      - Ted
> 
Ted,

based on this conversation, is there anything else I should do to have this
patch accepted?

btw, I can review the callers for ext4_bread() and ext3_getblk in order to audit
it, is that ok for you?
-- 
--Carlos
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