[PATCH 4.14 131/228] fsl/fman: fix dereference null return value

From: Greg Kroah-Hartman
Date: Thu Aug 20 2020 - 06:12:18 EST


From: Florinel Iordache <florinel.iordache@xxxxxxx>

[ 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.iordache@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 495190764155a..ac3d791f52821 100644
--- a/drivers/net/ethernet/freescale/fman/fman_port.c
+++ b/drivers/net/ethernet/freescale/fman/fman_port.c
@@ -1744,6 +1744,7 @@ 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;
@@ -1768,8 +1769,14 @@ 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