[PATCH 5.4 16/34] net: ll_temac: Fix potential NULL dereference in temac_probe()

[Greg Kroah-Hartman]

From: Zhang Changzhong <zhangchangzh...@huawei.com>

[ Upstream commit cc6596fc7295e9dcd78156ed42f9f8e1221f7530 ]

platform_get_resource() may fail and in this case a NULL dereference
will occur.

Fix it to use devm_platform_ioremap_resource() instead of calling
platform_get_resource() and devm_ioremap().

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);

Fixes: 8425c41d1ef7 ("net: ll_temac: Extend support to non-device-tree 
platforms")
Signed-off-by: Zhang Changzhong <zhangchangzh...@huawei.com>
Acked-by: Esben Haabendal <es...@geanix.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/xilinx/ll_temac_main.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -1425,9 +1425,7 @@ static int temac_probe(struct platform_d
                of_node_put(dma_np);
        } else if (pdata) {
                /* 2nd memory resource specifies DMA registers */
-               res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-               lp->sdma_regs = devm_ioremap_nocache(&pdev->dev, res->start,
-                                                    resource_size(res));
+               lp->sdma_regs = devm_platform_ioremap_resource(pdev, 1);
                if (IS_ERR(lp->sdma_regs)) {
                        dev_err(&pdev->dev,
                                "could not map DMA registers\n");