| Message ID | 20230403090321.835877-1-s-vadapalli@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net] net: ethernet: ti: am65-cpsw: Fix mdio cleanup in probe | expand |
On 03/04/2023 12:03, Siddharth Vadapalli wrote: > 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: a45cfcc69a25 ("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>
Hello: This patch was applied to netdev/net.git (main) by Paolo Abeni <pabeni@redhat.com>: On Mon, 3 Apr 2023 14:33:21 +0530 you wrote: > 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. > > [...] Here is the summary with links: - [net] net: ethernet: ti: am65-cpsw: Fix mdio cleanup in probe https://git.kernel.org/netdev/net/c/c6b486fb3368 You are awesome, thank you!
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 4e3861c47708..bcea87b7151c 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -2926,7 +2926,8 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev) am65_cpsw_nuss_phylink_cleanup(common); am65_cpts_release(common->cpts); 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); @@ -2956,7 +2957,8 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev) am65_cpts_release(common->cpts); am65_cpsw_disable_serdes_phy(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);
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: a45cfcc69a25 ("net: ethernet: ti: am65-cpsw-nuss: use of_platform_device_create() for mdio") Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> --- drivers/net/ethernet/ti/am65-cpsw-nuss.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)