[PATCH] net: xilinx: fix potential NULL dereference in temac_probe()

[Xu Wang]

platform_get_resource() may return NULL, add proper
check to avoid potential NULL dereferencing.

Signed-off-by: Xu Wang <vu...@iscas.ac.cn>
---
 drivers/net/ethernet/xilinx/ll_temac_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c 
b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 929244064abd..85a767fa2ecf 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -1408,6 +1408,8 @@ static int temac_probe(struct platform_device *pdev)
 
        /* map device registers */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res)
+               return -EINVAL;
        lp->regs = devm_ioremap(&pdev->dev, res->start,
                                        resource_size(res));
        if (!lp->regs) {
@@ -1503,6 +1505,8 @@ static int temac_probe(struct platform_device *pdev)
        } else if (pdata) {
                /* 2nd memory resource specifies DMA registers */
                res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+               if (!res)
+                       return -EINVAL;
                lp->sdma_regs = devm_ioremap(&pdev->dev, res->start,
                                                     resource_size(res));
                if (!lp->sdma_regs) {
-- 
2.17.1