netdev - [PATCH 1/1] wan/fsl_ucc_hdlc: avoid possible NULL pointer dereference

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Message-Id: <1469963663-3005-1-git-send-email-xypron.glpk@gmx.de>
Date:	Sun, 31 Jul 2016 13:14:23 +0200
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Zhao Qiang <qiang.zhao@....com>
Cc:	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH 1/1] wan/fsl_ucc_hdlc: avoid possible NULL pointer dereference

All assignments to components of priv should only
occur after the check if prif is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 2fc50ec..6f04445 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -862,7 +862,7 @@ static int uhdlc_suspend(struct device *dev)
 static int uhdlc_resume(struct device *dev)
 {
 	struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
-	struct ucc_tdm *utdm = priv->utdm;
+	struct ucc_tdm *utdm;
 	struct ucc_tdm_info *ut_info;
 	struct ucc_fast __iomem *uf_regs;
 	struct ucc_fast_private *uccf;
@@ -877,6 +877,7 @@ static int uhdlc_resume(struct device *dev)
 	if (!netif_running(priv->ndev))
 		return 0;
 
+	utdm = priv->utdm;
 	ut_info = priv->ut_info;
 	uf_info = &ut_info->uf_info;
 	uf_regs = priv->uf_regs;
-- 
2.8.1