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net: ethernet: ti: am65-cpsw: Fix mdio cleanup in probe

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[ Upstream commit c6b486fb33 ]

In the am65_cpsw_nuss_probe() function's cleanup path, the call to
of_platform_device_destroy() for the common->mdio_dev device is invoked
unconditionally. It is possible that either the MDIO node is not present
in the device-tree, or the MDIO node is disabled in the device-tree. In
both these cases, the MDIO device is not created, resulting in a NULL
pointer dereference when the of_platform_device_destroy() function is
invoked on the common->mdio_dev device on the cleanup path.

Fix this by ensuring that the common->mdio_dev device exists, before
attempting to invoke of_platform_device_destroy().

Fixes: a45cfcc69a ("net: ethernet: ti: am65-cpsw-nuss: use of_platform_device_create() for mdio")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20230403090321.835877-1-s-vadapalli@ti.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Siddharth Vadapalli 2023-04-03 14:33:21 +05:30 • committed by Greg Kroah-Hartman
commit bdbbd3fa58
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/ti/am65-cpsw-nuss.c
View file

@ -2153,7 +2153,8 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
return 0;
err_of_clear:
of_platform_device_destroy(common->mdio_dev, NULL);
if (common->mdio_dev)
of_platform_device_destroy(common->mdio_dev, NULL);
err_pm_clear:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
@ -2179,7 +2180,8 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev)
*/
am65_cpsw_nuss_cleanup_ndev(common);
of_platform_device_destroy(common->mdio_dev, NULL);
if (common->mdio_dev)
of_platform_device_destroy(common->mdio_dev, NULL);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);