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Date: Fri, 31 Jul 2020 09:46:06 +0300 From: Florinel Iordache <florinel.iordache@....com> To: madalin.bucur@....com, davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Florinel Iordache <florinel.iordache@....com> Subject: [PATCH net 2/5] fsl/fman: fix dereference null return value Check before using returned value to avoid dereferencing null pointer. Fixes: 18a6c85f ("fsl/fman: Add FMan Port Support") Signed-off-by: Florinel Iordache <florinel.iordache@....com> --- 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 87b26f0..c27df15 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; -- 1.9.1
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