CVE Published: 21/08/2024 |
CVE Updated: 04/11/2024 |
CVE Year: 2022 Source: Linux |
Vendor: Linux |
Product: Linux Status : PUBLISHED
CVE-2022-48894 Description
In the Linux kernel, the following vulnerability has been resolved:
iommu/arm-smmu-v3: Don\'t unregister on shutdown
Similar to SMMUv2, this driver calls iommu_device_unregister() from the
shutdown path, which removes the IOMMU groups with no coordination
whatsoever with their users - shutdown methods are optional in device
drivers. This can lead to NULL pointer dereferences in those drivers\'
DMA API calls, or worse.
Instead of calling the full arm_smmu_device_remove() from
arm_smmu_device_shutdown(), let\'s pick only the relevant function call -
arm_smmu_device_disable() - more or less the reverse of
arm_smmu_device_reset() - and call just that from the shutdown path.