net: mdio: Check regmap pointer returned by device_node_to_regmap()

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[ Upstream commit b2b526c2cf ]

The call to device_node_to_regmap() in airoha_mdio_probe() can return
an ERR_PTR() if regmap initialization fails. Currently, the driver
stores the pointer without validation, which could lead to a crash
if it is later dereferenced.

Add an IS_ERR() check and return the corresponding error code to make
the probe path more robust.

Fixes: 67e3ba9783 ("net: mdio: Add MDIO bus controller for Airoha AN7583")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251031161607.58581-1-alok.a.tiwari@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alok Tiwari 2025-10-31 09:15:53 -07:00 • committed by Greg Kroah-Hartman

parent 3c91c8f424

commit dc8ed38234

1 changed files with 2 additions and 0 deletions

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drivers/net/mdio/mdio-airoha.c

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