From: Nicholas Mc Guire <hofrat@osadl.org>
Date: Mon, 9 Jul 2018 19:16:40 +0000 (+0200)
Subject: can: mpc5xxx_can: check of_iomap return before use
X-Git-Tag: v4.4.154~59
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ae34cbea8c5378ca3b2a423260f4bc80e04a49d7;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git

can: mpc5xxx_can: check of_iomap return before use

[ Upstream commit b5c1a23b17e563b656cc9bb76ce5323b997d90e8 ]

of_iomap() can return NULL so that return needs to be checked and NULL
treated as failure. While at it also take care of the missing
of_node_put() in the error path.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: commit afa17a500a36 ("net/can: add driver for mscan family & mpc52xx_mscan")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/can/mscan/mpc5xxx_can.c b/drivers/net/can/mscan/mpc5xxx_can.c
index c7427bd..2949a38 100644
--- a/drivers/net/can/mscan/mpc5xxx_can.c
+++ b/drivers/net/can/mscan/mpc5xxx_can.c
@@ -86,6 +86,11 @@ static u32 mpc52xx_can_get_clock(struct platform_device *ofdev,
 		return 0;
 	}
 	cdm = of_iomap(np_cdm, 0);
+	if (!cdm) {
+		of_node_put(np_cdm);
+		dev_err(&ofdev->dev, "can't map clock node!\n");
+		return 0;
+	}
 
 	if (in_8(&cdm->ipb_clk_sel) & 0x1)
 		freq *= 2;