CVE-2026-64461

In the Linux kernel, the following vulnerability has been resolved:

PCI: mediatek: Fix IRQ domain leak when port fails to enable

When mtkpcieenableport() fails, mtkpcieportfree() removes the port from pcie->ports and frees the port structure. However, the IRQ domains set up earlier by mtkpcieinitirqdomain() are never freed.

Fix this by refactoring mtkpcieirqteardown() into a per-port helper, mtkpcieirqteardownport(), and calling it from mtkpciesetup() when mtkpcieenableport() fails. Since the IRQ teardown must only happen in the probe error path (during resume, child devices may have active MSI mappings and the NOIRQ context prohibits sleeping locks), mtkpcieenable_port() is changed to return an error code so callers can distinguish the two paths and act accordingly.

This issue was reported by Sashiko while reviewing the EcoNet EN7528 SoC support series.