Bug 1225043 (CVE-2021-47325)

Summary: VUL-0: CVE-2021-47325: kernel: iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Karasulli <vasant.karasulli>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: andrea.mattiazzo, jlee
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/406961/
Whiteboard: CVSSv3.1:SUSE:CVE-2021-47325:3.3:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-05-22 15:16:52 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation

The reference counting issue happens in several exception handling paths
of arm_smmu_iova_to_phys_hard(). When those error scenarios occur, the
function forgets to decrease the refcount of "smmu" increased by
arm_smmu_rpm_get(), causing a refcount leak.

Fix this issue by jumping to "out" label when those error scenarios
occur.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47325
https://www.cve.org/CVERecord?id=CVE-2021-47325
https://git.kernel.org/stable/c/0f0c5ea09139777d90729d408b807021f2ea6492
https://git.kernel.org/stable/c/43d1aaa1965f9b58035196dac49b1e1e6c9c25eb
https://git.kernel.org/stable/c/5f9741a9a91f25c89e04b408cd61e3ab050ce24b
https://git.kernel.org/stable/c/7c8f176d6a3fa18aa0f8875da6f7c672ed2a8554
https://git.kernel.org/stable/c/b11220803ad14a2a880cc06d8e01fe2548cc85b0
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47325.mbox