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7.1 High

CVE-2021-47327 In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak…

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0. The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak. Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.

Affected products and versions

Product Affected versions Fixed in
Linux 5.14 earliest → < 5.14 5.14
Linux 5.13 earliest → < 5.13.4 5.13.4
Linux 5.12 earliest → < 5.12.19 5.12.19
Linux 5.10 earliest → < 5.10.52 5.10.52
Linux 5.4 earliest → < 5.4.134 5.4.134
Linux 5.0 No fix stated
linux_kernel 5.14 earliest → < 5.14 5.14

References

Timeline

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