netdev - [PATCH v3] sh_eth: check platform data pointer

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Message-Id: <201310302330.19491.sergei.shtylyov@cogentembedded.com>
Date:	Wed, 30 Oct 2013 23:30:19 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	netdev@...r.kernel.org
Cc:	nobuhiro.iwamatsu.yj@...esas.com, linux-sh@...r.kernel.org
Subject: [PATCH v3] sh_eth: check platform data pointer

Check the platform data pointer before dereferencing it and error out of the
probe() method if it's NULL.

This has additional effect of preventing kernel oops with outdated platform data
containing zero PHY address instead (such as on SolutionEngine7710).

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

---
This patch is against David Miller's 'net-next.git' repo.

Changes in version 3:
- refreshed the patch.

Changes in version 2:
- refreshed the patch.

 drivers/net/ethernet/renesas/sh_eth.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -2663,6 +2663,12 @@ static int sh_eth_drv_probe(struct platf
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_resume(&pdev->dev);
 
+	if (!pd) {
+		dev_err(&pdev->dev, "no platform data\n");
+		ret = -EINVAL;
+		goto out_release;
+	}
+
 	/* get PHY ID */
 	mdp->phy_id = pd->phy;
 	mdp->phy_interface = pd->phy_interface;
--
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