In the Linux kernel, the following vulnerability has been resolved: net: mdio: Check regmap pointer returned by devicenodetoregmap() The call to devicenodetoregmap() in airohamdioprobe() can return an ERRPTR() 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 ISERR() check and return the corresponding error code to make the probe path more robust.