linux-kernel - Re: [PATCH] PCI: endpoint: Fix NULL pointer dereference for ->get

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Date:   Mon, 6 Jul 2020 12:17:08 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Sriram Dash <sriram.dash@...sung.com>
Cc:     'Kishon Vijay Abraham I' <kishon@...com>,
        'Shradha Todi' <shradha.t@...sung.com>, bhelgaas@...gle.com,
        pankaj.dubey@...sung.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: endpoint: Fix NULL pointer dereference for
 ->get_features()

On Thu, Apr 02, 2020 at 08:01:59PM +0530, Sriram Dash wrote:

[...]

> > So the patch itself is correct though the commit log has to be fixed. You should
> > also check if all the endpoint controller drivers existing currently provides
> > epc_features.
> 
> At the moment, there is no issue for existing controller drivers as I
> can see almost all drivers are providing epc_features. But, this is
> not a mandatory feature and some controller drivers may not have
> epc_features implemented, may be in the near future.  But because we
> are dealing with the configfs, the application need not bother about
> the driver details underneath.
> 
> IMO, the code should be fixed regardless and should not cause panic in
> any case.

What's this patch status please ?

Thanks,
Lorenzo

> > Thanks
> > Kishon
> > >
> > >
> > >>  drivers/pci/endpoint/functions/pci-epf-test.c | 15 +++++++++------
> > >>  1 file changed, 9 insertions(+), 6 deletions(-)
> > >>
> > >> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c
> > >> b/drivers/pci/endpoint/functions/pci-epf-test.c
> > >> index c9121b1b9fa9..af4537a487bf 100644
> > >> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> > >> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> > >> @@ -510,14 +510,17 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> > >>  		return -EINVAL;
> > >>
> > >>  	epc_features = pci_epc_get_features(epc, epf->func_no);
> > >> -	if (epc_features) {
> > >> -		linkup_notifier = epc_features->linkup_notifier;
> > >> -		msix_capable = epc_features->msix_capable;
> > >> -		msi_capable = epc_features->msi_capable;
> > >> -		test_reg_bar = pci_epc_get_first_free_bar(epc_features);
> > >> -		pci_epf_configure_bar(epf, epc_features);
> > >> +	if (!epc_features) {
> > >> +		dev_err(dev, "epc_features not implemented\n");
> > >> +		return -ENOTSUPP;
> > >>  	}
> > >>
> > >> +	linkup_notifier = epc_features->linkup_notifier;
> > >> +	msix_capable = epc_features->msix_capable;
> > >> +	msi_capable = epc_features->msi_capable;
> > >> +	test_reg_bar = pci_epc_get_first_free_bar(epc_features);
> > >> +	pci_epf_configure_bar(epf, epc_features);
> > >> +
> > >>  	epf_test->test_reg_bar = test_reg_bar;
> > >>  	epf_test->epc_features = epc_features;
> > >>
> > >> --
> > >> 2.17.1
> > >
> > >
>