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, pci_epf_test_alloc_space() allocates all BARs,

which are further freed if epc_set_bar() fails (for instance, due to no

free inbound window).

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

pci_epc_set_bar() ->

pci_epf_free_space()

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 pci_epf_alloc_space() and pci_epf_free_space()

invocations are symmetric, and as such, set epf_test->reg[bar] to NULL

when memory is freed.

[kwilczynski: commit log]