CVE - CVE-2021-47327

CVE-ID
CVE-2021-47327	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d URL:https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d MISC:https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f URL:https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f MISC:https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 URL:https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2 MISC:https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 URL:https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3 MISC:https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a URL:https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a
Assigning CNA
kernel.org
Date Record Created
20240521	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240521)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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