Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root acpi_pci_root_add() assigns the freshly allocated root to device->driver_data before dmar_device_add() and pci_acpi_scan_root(). Both failure paths reach the end: label where root is kfree()'d, but only the pci_acpi_scan_root() path clears driver_data first. When dmar_device_add() fails during a hot-add, root is freed while device->driver_data still points at it. The ACPI core does not clear driver_data on attach failure, so a later acpi_pci_find_root() call may dereference this dangling pointer. acpi_pci_root_remove() has the same problem: it frees root without clearing device->driver_data, leaving a dangling pointer behind after the root bridge is removed. Move the NULL assignment to the shared end: label so every error path in acpi_pci_root_add() clears driver_data before freeing root, and clear it in acpi_pci_root_remove() as well, so the object is never left reachable through driver_data after being freed.
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
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 321bb0eb1486a0d575f02e24e3f4170e408c2f51affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < a285fa3780c768dcc51c76768707d099a2cc611daffecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 6aaf6dbf54fdfae096f3f90a79e9614e46579280affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 70cf773cca30a10b4964c24520a71279c974b899affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 3eee4c21931dc048ce63b86809f04e4e6f0dcad5affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217affecteddb89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to < 8a742141f7ab84975aa758b775567ef4740ef0cfaffected
Linux Linux
Default version status: affected
2.6.28affected0 to < 2.6.28unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51 ↗
- https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2 ↗
- https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d ↗
- https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280 ↗
- https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899 ↗
- https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5 ↗
- https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217 ↗
- https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf ↗