Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ad86ac604f8391c0212a91412d4f764c7a85f254; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 01e8751b37a366b1ca561add0042f2ceb18c03bf; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b803811485ac0b2f774b6bf3abc8b999ba3b7033; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 29f60d3d06818d40118a30d663231f027ae87a05; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0398b641be2b66c2fc7e0163c606ef19372e7ad5; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f132e089fe89cadc2098991f0a3cb05c3f824ac6 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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