On Mon, Apr 27, 2020 at 05:29:50PM +0530, Vignesh Raghavendra wrote:
> Hi,
>
> On 27/04/20 4:40 pm, Wei Yongjun wrote:
> > platform_get_resource() may fail and return NULL, so we should
> > better check it's return value to avoid a NULL pointer dereference
> > a bit later in the code.
> >
> > This is detected by Coccinelle semantic patch.
> >
> > @@
> > expression pdev, res, n, t, e, e1, e2;
> > @@
> >
> > res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
> > + if (!res)
> > + return -EINVAL;
> > ... when != res == NULL
> > e = devm_ioremap(e1, res->start, e2);
> >
> > Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
> > ---
> > drivers/pci/controller/dwc/pci-dra7xx.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
> > index 3b0e58f2de58..7a3d12f7e7d9 100644
> > --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> > +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> > @@ -878,6 +878,9 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
> > }
> >
> > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
^^^^
> > + if (!res)
> > + return -EINVAL;
> > +
> > base = devm_ioremap(dev, res->start, resource_size(res));
^^^
>
> I don't see why this should be devm_ioremap(). It should also have been
> devm_ioremap_resource() which does the NULL check.
It's different device pointers.
regards,
dan carpenter
