linux-kernel - Re: [PATCH v2 1/5] misc: pci_endpoint_test: Fix the return value of IOCTL

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Message-ID: <20220824142545.GB4767@thinkpad>
Date:   Wed, 24 Aug 2022 19:55:45 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     kishon@...com, lpieralisi@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, mie@...l.co.jp, kw@...ux.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/5] misc: pci_endpoint_test: Fix the return value of
 IOCTL

On Wed, Aug 24, 2022 at 02:43:18PM +0200, Greg KH wrote:
> On Wed, Aug 24, 2022 at 06:00:06PM +0530, Manivannan Sadhasivam wrote:
> > IOCTLs are supposed to return 0 for success and negative error codes for
> > failure. Currently, this driver is returning 0 for failure and 1 for
> > success, that's not correct. Hence, fix it!
> > 
> > Cc: stable@...r.kernel.org #5.10
> > Fixes: 2c156ac71c6b ("misc: Add host side PCI driver for PCI test function device")
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Reported-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> > ---
> >  drivers/misc/pci_endpoint_test.c | 163 ++++++++++++++-----------------
> >  1 file changed, 76 insertions(+), 87 deletions(-)
> > 
> > diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> > index 8f786a225dcf..a7d8ae9730f6 100644
> > --- a/drivers/misc/pci_endpoint_test.c
> > +++ b/drivers/misc/pci_endpoint_test.c
> > @@ -174,13 +174,12 @@ static void pci_endpoint_test_free_irq_vectors(struct pci_endpoint_test *test)
> >  	test->irq_type = IRQ_TYPE_UNDEFINED;
> >  }
> >  
> > -static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
> > +static int pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
> >  						int type)
> >  {
> > -	int irq = -1;
> > +	int irq = -ENOSPC;
> 
> No need to set this if you:
> 
> >  	struct pci_dev *pdev = test->pdev;
> >  	struct device *dev = &pdev->dev;
> > -	bool res = true;
> >  
> >  	switch (type) {
> >  	case IRQ_TYPE_LEGACY:
> > @@ -202,15 +201,16 @@ static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
> >  		dev_err(dev, "Invalid IRQ type selected\n");
> 
> This should now return -EINVAL;
> 

ack

> 
> >  	}
> >  
> > +	test->irq_type = type;
> 
> Again, do not make a change to the kernel state if there is an error
> above.  That's wrong to do, and yes, the current code is incorrect,
> don't keep that bug here as well when it's so easy to fix up
> automatically.
> 

Okay. Will fix it in this patch itself.

Thanks,
Mani

> 
> I stopped reviewing here...
> 
> thanks,
> 
> greg k-h

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