linux-kernel - [PATCH] PCI: exynos: fix the NULL pointer dereference about elbi

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Date:   Tue, 07 Mar 2017 19:54:05 +0900
From:   Jaehoon Chung <jh80.chung@...sung.com>
To:     linux-pci@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, helgaas@...nel.org,
        jingoohan1@...il.com, Jaehoon Chung <jh80.chung@...sung.com>
Subject: [PATCH] PCI: exynos: fix the NULL pointer dereference about elbi_base

Even though using phy framework, it has to get the elbi_base.
Before this patch, elbi_base should be NULL pointer.

Fixes: e7cd7ef58e1f ("PCI: exynos: Support the PHY generic framework")

Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
---
 drivers/pci/dwc/pci-exynos.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index 993b650..44f774c 100644
--- a/drivers/pci/dwc/pci-exynos.c
+++ b/drivers/pci/dwc/pci-exynos.c
@@ -132,10 +132,6 @@ static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
 	struct device *dev = pci->dev;
 	struct resource *res;
 
-	/* If using the PHY framework, doesn't need to get other resource */
-	if (ep->using_phy)
-		return 0;
-
 	ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
 	if (!ep->mem_res)
 		return -ENOMEM;
@@ -145,6 +141,10 @@ static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
 	if (IS_ERR(ep->mem_res->elbi_base))
 		return PTR_ERR(ep->mem_res->elbi_base);
 
+	/* If using the PHY framework, doesn't need to get other resource */
+	if (ep->using_phy)
+		return 0;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	ep->mem_res->phy_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(ep->mem_res->phy_base))
-- 
2.10.2