cve-2023-52792
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2024-08-02 23:11
Severity
Summary
cxl/region: Do not try to cleanup after cxl_region_setup_targets() fails
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0718588c7aaa7a1510b4de972370535b61dddd0d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07ffcd8ec79cf7383e1e45815f4842fd357991c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9090c5537c93cd0811ab7bfbd925b57addfffb60
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90db4c1d5ebaf574d3c3065c055977982c378a83
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Do not try to cleanup after cxl_region_setup_targets() fails\n\nCommit 5e42bcbc3fef (\"cxl/region: decrement -\u003enr_targets on error in\ncxl_region_attach()\") tried to avoid \u0027eiw\u0027 initialization errors when\n-\u003enr_targets exceeded 16, by just decrementing -\u003enr_targets when\ncxl_region_setup_targets() failed.\n\nCommit 86987c766276 (\"cxl/region: Cleanup target list on attach error\")\nextended that cleanup to also clear cxled-\u003epos and p-\u003etargets[pos]. The\ninitialization error was incidentally fixed separately by:\nCommit 8d4285425714 (\"cxl/region: Fix port setup uninitialized variable\nwarnings\") which was merged a few days after 5e42bcbc3fef.\n\nBut now the original cleanup when cxl_region_setup_targets() fails\nprevents endpoint and switch decoder resources from being reused:\n\n1) the cleanup does not set the decoder\u0027s region to NULL, which results\n   in future dpa_size_store() calls returning -EBUSY\n2) the decoder is not properly freed, which results in future commit\n   errors associated with the upstream switch\n\nNow that the initialization errors were fixed separately, the proper\ncleanup for this case is to just return immediately. Then the resources\nassociated with this target get cleanup up as normal when the failed\nregion is deleted.\n\nThe -\u003enr_targets decrement in the error case also helped prevent\na p-\u003etargets[] array overflow, so add a new check to prevent against\nthat overflow.\n\nTested by trying to create an invalid region for a 2 switch * 2 endpoint\ntopology, and then following up with creating a valid region."
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