[PATCH -next] PCI: dwc: pci-dra7xx: Fix potential NULL dereference in dra7xx_pcie_probe()

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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));
 	if (!base)
 		return -ENOMEM;








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