CVE-2025-38069

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

PCI: endpoint: pci-epf-test: Fix double free that causes kernel to oops

Fix a kernel oops found while testing the stm32_pcie Endpoint driver with handling of PERST# deassertion:

During EP initialization, pciepftestallocspace() allocates all BARs, which are further freed if epcsetbar() fails (for instance, due to no free inbound window).

However, when pciepcset_bar() fails, the error path:

pciepcsetbar() -> pciepffreespace()

does not clear the previous assignment to epf_test->reg[bar].

Then, if the host reboots, the PERST# deassertion restarts the BAR allocation sequence with the same allocation failure (no free inbound window), creating a double free situation since epf_test->reg[bar] was deallocated and is still non-NULL.

Thus, make sure that pciepfallocspace() and pciepffreespace() invocations are symmetric, and as such, set epf_test->reg[bar] to NULL when memory is freed.

[kwilczynski: commit log]