[PATCH 5.8 361/464] fsl/fman: fix dereference null return value

[Greg Kroah-Hartman]

From: Florinel Iordache <florinel.iorda...@nxp.com>

[ Upstream commit 0572054617f32670abab4b4e89a876954d54b704 ]

Check before using returned value to avoid dereferencing null pointer.

Fixes: 18a6c85fcc78 ("fsl/fman: Add FMan Port Support")
Signed-off-by: Florinel Iordache <florinel.iorda...@nxp.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/ethernet/freescale/fman/fman_port.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman_port.c 
b/drivers/net/ethernet/freescale/fman/fman_port.c
index 87b26f063cc82..c27df153f8959 100644
--- a/drivers/net/ethernet/freescale/fman/fman_port.c
+++ b/drivers/net/ethernet/freescale/fman/fman_port.c
@@ -1767,6 +1767,7 @@ static int fman_port_probe(struct platform_device *of_dev)
        struct fman_port *port;
        struct fman *fman;
        struct device_node *fm_node, *port_node;
+       struct platform_device *fm_pdev;
        struct resource res;
        struct resource *dev_res;
        u32 val;
@@ -1791,8 +1792,14 @@ static int fman_port_probe(struct platform_device 
*of_dev)
                goto return_err;
        }
 
-       fman = dev_get_drvdata(&of_find_device_by_node(fm_node)->dev);
+       fm_pdev = of_find_device_by_node(fm_node);
        of_node_put(fm_node);
+       if (!fm_pdev) {
+               err = -EINVAL;
+               goto return_err;
+       }
+
+       fman = dev_get_drvdata(&fm_pdev->dev);
        if (!fman) {
                err = -EINVAL;
                goto return_err;
-- 
2.25.1