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fsl/fman: fix dereference null return value

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[ Upstream commit 0572054617f32670abab4b4e89a876954d54b704 ]

Check before using returned value to avoid dereferencing null pointer.

Fixes: 18a6c85fcc ("fsl/fman: Add FMan Port Support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florinel Iordache 2020-08-03 10:07:31 +03:00 • committed by Greg Kroah-Hartman
commit a405fb3ffd
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/freescale/fman/fman_port.c
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@ -1756,6 +1756,7 @@ 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;
@ -1780,8 +1781,14 @@ 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;