netdev - [RFT PATCH] net: axienet: Fix devm_ioremap

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Date:	Thu,  9 Jul 2015 22:21:20 +0900
From:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>
To:	Anirudha Sarangi <anirudh@...inx.com>,
	John Linn <John.Linn@...inx.com>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
	<stable@...r.kernel.org>
Subject: [RFT PATCH] net: axienet: Fix devm_ioremap_resource return value check

Value returned by devm_ioremap_resource() was checked for non-NULL but
devm_ioremap_resource() returns IOMEM_ERR_PTR, not NULL. In case of
error this could lead to dereference of ERR_PTR.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
Cc: <stable@...r.kernel.org>
Fixes: 46aa27df8853 ("net: axienet: Use devm_* calls")

---

Patch only compile tested.
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 4208dd7ef101..d95f9aae95e7 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1530,9 +1530,9 @@ static int axienet_probe(struct platform_device *pdev)
 	/* Map device registers */
 	ethres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	lp->regs = devm_ioremap_resource(&pdev->dev, ethres);
-	if (!lp->regs) {
+	if (IS_ERR(lp->regs)) {
 		dev_err(&pdev->dev, "could not map Axi Ethernet regs.\n");
-		ret = -ENOMEM;
+		ret = PTR_ERR(lp->regs);
 		goto free_netdev;
 	}
 
@@ -1599,9 +1599,9 @@ static int axienet_probe(struct platform_device *pdev)
 		goto free_netdev;
 	}
 	lp->dma_regs = devm_ioremap_resource(&pdev->dev, &dmares);
-	if (!lp->dma_regs) {
+	if (IS_ERR(lp->dma_regs)) {
 		dev_err(&pdev->dev, "could not map DMA regs\n");
-		ret = -ENOMEM;
+		ret = PTR_ERR(lp->dma_regs);
 		goto free_netdev;
 	}
 	lp->rx_irq = irq_of_parse_and_map(np, 1);
-- 
2.1.4

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