CVE-2021-47327: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails

First published: Tue May 21 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• agent/references
• agent/title
• agent/type
• agent/description
• agent/first-publish-date
• agent/author
• agent/severity
• agent/weakness
• agent/event
• collector/mitre-cve
• source/MITRE
• agent/source
• agent/guess-ai
• agent/software-canonical-lookup
• agent/software-canonical-lookup-request
• collector/nvd-api
• source/NVD
• agent/remedy
• agent/last-modified-date
• agent/softwarecombine
• agent/tags
• vendor/linux
• canonical/linux kernel
• version/linux kernel/5.5
• version/linux kernel/5.11
• version/linux kernel/5.13