netdev - [PATCH] ptp_qoriq: fix NULL access if ptp dt node missing

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Date:   Thu, 9 May 2019 03:07:12 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Richard Cochran <richardcochran@...il.com>,
        David Miller <davem@...emloft.net>
CC:     Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        "Y.b. Lu" <yangbo.lu@....com>
Subject: [PATCH] ptp_qoriq: fix NULL access if ptp dt node missing

From: Claudiu Manoil <claudiu.manoil@....com>

Make sure ptp dt node exists before accessing it in case
of NULL pointer call trace.

Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
Signed-off-by: Yangbo Lu <yangbo.lu@....com>
---
 drivers/ptp/ptp_qoriq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
index 53775362aac6..e10642403b25 100644
--- a/drivers/ptp/ptp_qoriq.c
+++ b/drivers/ptp/ptp_qoriq.c
@@ -467,6 +467,9 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
 	unsigned long flags;
 	u32 tmr_ctrl;
 
+	if (!node)
+		return -ENODEV;
+
 	ptp_qoriq->base = base;
 	ptp_qoriq->caps = *caps;
 
-- 
2.17.1