| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49000: iommu/vt-d: Fix PCI device refcount leak in has_external_pci() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iommu/vt-d: Fix PCI device refcount leak in has_external_pci() |
| |
| for_each_pci_dev() is implemented by pci_get_device(). The comment of |
| pci_get_device() says that it will increase the reference count for the |
| returned pci_dev and also decrease the reference count for the input |
| pci_dev @from if it is not NULL. |
| |
| If we break for_each_pci_dev() loop with pdev not NULL, we need to call |
| pci_dev_put() to decrease the reference count. Add the missing |
| pci_dev_put() before 'return true' to avoid reference count leak. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49000 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.0 with commit 89a6079df791aeace2044ea93be1b397195824ec and fixed in 5.10.158 with commit 10ed7655a17f6a3eaecd1293830488259ccd5723 |
| Issue introduced in 5.0 with commit 89a6079df791aeace2044ea93be1b397195824ec and fixed in 5.15.82 with commit b6eea8b2e858a20ad58ac62dc2de90fea2413f94 |
| Issue introduced in 5.0 with commit 89a6079df791aeace2044ea93be1b397195824ec and fixed in 6.0.12 with commit 17f67414718e6aba123335a33b7d15aa594fff34 |
| Issue introduced in 5.0 with commit 89a6079df791aeace2044ea93be1b397195824ec and fixed in 6.1 with commit afca9e19cc720bfafc75dc5ce429c185ca93f31d |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49000 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/iommu/intel/iommu.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/10ed7655a17f6a3eaecd1293830488259ccd5723 |
| https://git.kernel.org/stable/c/b6eea8b2e858a20ad58ac62dc2de90fea2413f94 |
| https://git.kernel.org/stable/c/17f67414718e6aba123335a33b7d15aa594fff34 |
| https://git.kernel.org/stable/c/afca9e19cc720bfafc75dc5ce429c185ca93f31d |
