linux-kernel - Re: [PATCH v3 0/2] pci: endpoint: Fix double free in pci_epf

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Message-ID: <alpine.LNX.2.20.1802281130190.29501@5HSWXM1.fritz.box>
Date:   Wed, 28 Feb 2018 11:35:32 +0100 (CET)
From:   Rolf Evers-Fischer <embedded24@...rs-fischer.de>
To:     Bjorn Helgaas <helgaas@...nel.org>
cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rolf Evers-Fischer <embedded24@...rs-fischer.de>,
        kishon@...com, bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, andy.shevchenko@...il.com
Subject: Re: [PATCH v3 0/2] pci: endpoint: Fix double free in
 pci_epf_create()

Hello Bjorn!

On Tue, 27 Feb 2018, Bjorn Helgaas wrote:

> On Tue, Feb 27, 2018 at 10:20:30AM +0000, Lorenzo Pieralisi wrote:
> > On Tue, Feb 27, 2018 at 11:02:28AM +0100, Rolf Evers-Fischer wrote:
> > > This is version 3 of a patchset to avoid double free in function
> > > 'pci_epf_create()'.
> > > 
> > > When I accidentally created a new endpoint device with an empty name,
> > > the kernel warned about "attempted to be registered with empty name!"
> > > and crashed afterwards.
> > > 
> > > It turned out that the crash was not caused by the 'device_add()'
> > > function itself, but by a double kfree of 'epf->name' and 'epf'.
> > > 
> > > The first patch just simplifies the code, while the second patch
> > > fixes the problem.
> > > 
> > > Changes in v3:
> > > - Matched to other pending pci endpoint commits (thanks, Bjorn!)
> > > - Added "Fixes" tag in patch 2 (thanks, Andy!)
> > > 
> > > Changes in v2:
> > > - Based on feedback from Lorenzo, Andy and Kishon (thanks!)
> > > - Change IDs removed
> > > - First patch completely reworked in order to eliminate the
> > >   need for the second 'kstrdup' allocation and the 'kfree' of
> > >   the first allocation.
> > >   It was tested with name="pci_epf_test.0" and name="pci_epb":
> > >   The 'epf->name' was "pci_epf_test" or "pci_epb" (=unchanged).
> > > 
> > > Rolf Evers-Fischer (2):
> > >   pci: endpoint: Simplify name allocation for epf device
> > >   pci: endpoint: Fix kernel panic after put_device()
> >     ^^^
> > 
> > s/pci/PCI
> > 
> > Bjorn pointed that out too, I can do it when merging the patches myself
> > just a hint in case you have to respin it again, no problem.
> 
> I wonder if Rolf posted the wrong version accidentally, since he
> mentioned making these match, but I don't see anything different in
> this posting.  Oh, never mind, I see the response about rebasing.
> I should have been more clear about what I was looking for.
> 
> Also s/epf/EPF/, since "epf" isn't a real word.
> 

It was my mistake. I should have asked you to clarify your request - 
especially after detecting that rebasing the commits didn't change 
anything.

Nevertheless, it seems that there will be soon a v4, where the s/pci/PCI 
and the s/epf/EPF can be done along with.

Best regards,
 Rolf