Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() In acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE device and then reassigned an ISA device: dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...); dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...); If the first lookup succeeds but the second fails, dev becomes NULL. This leads to a potential null-pointer dereference when dev_dbg() is called: if (errata.piix4.bmisx) dev_dbg(&dev->dev, ...); To prevent this, use two temporary pointers and retrieve each device independently, avoiding overwriting dev with a possible NULL value. [ rjw: Subject adjustment, added an empty code line ]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ad86ac604f8391c0212a91412d4f764c7a85f254affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 01e8751b37a366b1ca561add0042f2ceb18c03bfaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b803811485ac0b2f774b6bf3abc8b999ba3b7033affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 29f60d3d06818d40118a30d663231f027ae87a05affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 0398b641be2b66c2fc7e0163c606ef19372e7ad5affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f132e089fe89cadc2098991f0a3cb05c3f824ac6affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.15.202 to ≤ 5.15.*unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.16 to ≤ 6.18.*unaffected6.19.6 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 ↗
- https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254 ↗
- https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf ↗
- https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033 ↗
- https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05 ↗
- https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5 ↗
- https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6 ↗