CVE-2024-43824: PCI: endpoint: pci-epf-test: Make use of cached 'epc_features' in pci_epf_test_core_init()
First published: Sat Aug 17 2024(Updated: )
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 log]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.7<6.10.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1 | 6.11.10-1 6.12.5-1 |
| >=5.7<6.10.3 |
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Reference Links
- https://git.kernel.org/stable/c/5a5095a8bd1bd349cce1c879e5e44407a34dda8a
- https://git.kernel.org/stable/c/af4ad016abb1632ff7ee598a6037952b495e5b80
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-43824
- https://nvd.nist.gov/vuln/detail/CVE-2024-43824
- https://launchpad.net/bugs/cve/CVE-2024-43824
- https://security-tracker.debian.org/tracker/CVE-2024-43824
- https://ubuntu.com/security/CVE-2024-43824
- https://git.kernel.org/linus/5a5095a8bd1bd349cce1c879e5e44407a34dda8a
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