linux-kernel - Re: [tpmdd-devel] [PATCH] TPM: Avoid reference to potentially freed memory

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Message-ID: <20151030113810.GA31463@intel.com>
Date:	Fri, 30 Oct 2015 13:38:10 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Marion & Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:	kernel-janitors@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH] TPM: Avoid reference to potentially freed
 memory

On Thu, Oct 29, 2015 at 12:48:44PM +0200, Jarkko Sakkinen wrote:
> On Thu, Oct 29, 2015 at 07:12:01AM +0100, Marion & Christophe JAILLET wrote:
> > 
> > 
> > Le 27/10/2015 11:27, Jarkko Sakkinen a écrit :
> > >On Fri, Oct 23, 2015 at 10:37:33AM +0300, Jarkko Sakkinen wrote:
> > >>On Thu, Oct 22, 2015 at 10:32:41PM +0200, Christophe JAILLET wrote:
> > >>>Reference to the 'np' node is dropped before dereferencing the 'sizep' and
> > >>>'basep' pointers, which could by then point to junk if the node has been
> > >>>freed.
> > >>>
> > >>>Refactor code to call 'of_node_pup' later.
> > >>>
> > >>>Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > >>LGTM.
> > >Is there anyone able to provide Tested-by for this?
> > >
> > >Christophe, were you able to reproduce the crash (insmod/rmmod couple
> > >of times maybe?) and validate that it was gone after fixing the bug?
> > 
> > Hi,
> > no, I never triggered the bug.
> > This is just something noticed while looking at potential issues related to
> > incorrect use of 'of_node_pup'.
> > I only compile tested the patch.
> 
> The fix is so obvious that I see no reason not to include it. Thanks for
> the good work.

I'm getting

$ git am ~/tmp/of-fix.patch 
Applying: TPM: Avoid reference to potentially freed memory
error: patch failed: drivers/char/tpm/tpm_of.c:53
error: drivers/char/tpm/tpm_of.c: patch does not apply
Patch failed at 0001 TPM: Avoid reference to potentially freed memory
The copy of the patch that failed is found in:
   /home/jsakkine/projects/tpm2/git/linux-tpmdd/.git/rebase-apply/patch
   When you have resolved this problem, run "git am --continue".
   If you prefer to skip this patch, run "git am --skip" instead.
   To restore the original branch and stop patching, run "git am
   --abort".

I'm applying this against Linus tree (4.3-rc7).

/Jarkko
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