CVE-2024-43824

/// Technical description

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

PCI: endpoint: pci-epf-test: Make use of cached 'epc_features' in pci_epf_test_core_init()

Instead of getting the epc_features from pci_epc_get_features() API, use

the cached pci_epf_test::epc_features value to avoid the NULL check. Since

the NULL check is already performed in pci_epf_test_bind(), having one more

check in pci_epf_test_core_init() is redundant and it is not possible to

hit the NULL pointer dereference.

Also with commit a01e7214bef9 ("PCI: endpoint: Remove "core_init_notifier"

flag"), 'epc_features' got dereferenced without the NULL check, leading to

the following false positive Smatch warning:

drivers/pci/endpoint/functions/pci-epf-test.c:784 pci_epf_test_core_init() error: we previously assumed 'epc_features' could be null (see line 747)

Thus, remove the redundant NULL check and also use the epc_features::

{msix_capable/msi_capable} flags directly to avoid local variables.

[kwilczynski: commit

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References