CVE-2022-48854: net: arc_emac: Fix use after free in arc_mdio_probe()

First published: Tue Jul 16 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: net: arc_emac: Fix use after free in arc_mdio_probe() If bus->state is equal to MDIOBUS_ALLOCATED, mdiobus_free(bus) will free the "bus". But bus->name is still used in the next line, which will lead to a use after free. We can fix it by putting the name in a local variable and make the bus->name point to the rodata section "name",then use the name in the error message without referring to bus to avoid the uaf.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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