| 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-2024-41078: btrfs: qgroup: fix quota root leak after quota disable failure |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| btrfs: qgroup: fix quota root leak after quota disable failure |
| |
| If during the quota disable we fail when cleaning the quota tree or when |
| deleting the root from the root tree, we jump to the 'out' label without |
| ever dropping the reference on the quota root, resulting in a leak of the |
| root since fs_info->quota_root is no longer pointing to the root (we have |
| set it to NULL just before those steps). |
| |
| Fix this by always doing a btrfs_put_root() call under the 'out' label. |
| This is a problem that exists since qgroups were first added in 2012 by |
| commit bed92eae26cc ("Btrfs: qgroup implementation and prototypes"), but |
| back then we missed a kfree on the quota root and free_extent_buffer() |
| calls on its root and commit root nodes, since back then roots were not |
| yet reference counted. |
| |
| The Linux kernel CVE team has assigned CVE-2024-41078 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.223 with commit 94818bdb00ef34a996a06aa63d11f591074cb757 |
| Fixed in 5.15.164 with commit 8a69529f22590b67bb018de9acbcf94abc8603cf |
| Fixed in 6.1.101 with commit 5ef3961682e5310f2221bae99bcf9f5d0f4b0d51 |
| Fixed in 6.6.42 with commit f88aeff5a173e8ba3133314eb4b964236ef3589d |
| Fixed in 6.9.11 with commit 7dd6a5b96157a21245566b21fd58276a214357ff |
| Fixed in 6.10 with commit a7e4c6a3031c74078dba7fa36239d0f4fe476c53 |
| |
| 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-2024-41078 |
| 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: |
| fs/btrfs/qgroup.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/94818bdb00ef34a996a06aa63d11f591074cb757 |
| https://git.kernel.org/stable/c/8a69529f22590b67bb018de9acbcf94abc8603cf |
| https://git.kernel.org/stable/c/5ef3961682e5310f2221bae99bcf9f5d0f4b0d51 |
| https://git.kernel.org/stable/c/f88aeff5a173e8ba3133314eb4b964236ef3589d |
| https://git.kernel.org/stable/c/7dd6a5b96157a21245566b21fd58276a214357ff |
| https://git.kernel.org/stable/c/a7e4c6a3031c74078dba7fa36239d0f4fe476c53 |
