CVE-2024-53075 Information

Description

In the Linux kernel the following vulnerability has been resolved:

riscv: Prevent a bad reference count on CPU nodes

When populating cache leaves we previously fetched the CPU device node at the very beginning. But when ACPI is enabled we go through a specific branch which returns early and does not call ‘of_node_put’ for the node that was acquired.

Since we are not using a CPU device node for the ACPI code anyways we can simply move the initialization of it just passed the ACPI block and we are guaranteed to have an ‘of_node_put’ call for the acquired node. This prevents a bad reference count of the CPU device node.

Moreover the previous function did not check for errors when acquiring the device node so a return -ENOENT has been added for that case.

Reference

https://git.kernel.org/stable/c/303846a3dc275e35fbb556d72f1e356ba669e4f8 https://git.kernel.org/stable/c/37233169a6ea912020c572f870075a63293b786a