| From bippy-1.0.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-40951: ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger() |
| |
| bdev->bd_super has been removed and commit 8887b94d9322 change the usage |
| from bdev->bd_super to b_assoc_map->host->i_sb. Since ocfs2 hasn't set |
| bh->b_assoc_map, it will trigger NULL pointer dereference when calling |
| into ocfs2_abort_trigger(). |
| |
| Actually this was pointed out in history, see commit 74e364ad1b13. But |
| I've made a mistake when reviewing commit 8887b94d9322 and then |
| re-introduce this regression. |
| |
| Since we cannot revive bdev in buffer head, so fix this issue by |
| initializing all types of ocfs2 triggers when fill super, and then get the |
| specific ocfs2 trigger from ocfs2_caching_info when access journal. |
| |
| [joseph.qi@linux.alibaba.com: v2] |
| |
| The Linux kernel CVE team has assigned CVE-2024-40951 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 8887b94d93224e0ef7e1bc6369640e313b8b12f4 and fixed in 6.6.36 with commit 67bcecd780609f471260a8c83fb0ae15f27734ce |
| Issue introduced in 6.6 with commit 8887b94d93224e0ef7e1bc6369640e313b8b12f4 and fixed in 6.9.7 with commit eb63357ef229fae061ce7ce2839d558681c42f1a |
| Issue introduced in 6.6 with commit 8887b94d93224e0ef7e1bc6369640e313b8b12f4 and fixed in 6.10 with commit 685d03c3795378fca6a1b3d43581f7f1a3fc095f |
| |
| 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-2024-40951 |
| 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/ocfs2/journal.c |
| fs/ocfs2/ocfs2.h |
| fs/ocfs2/super.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/67bcecd780609f471260a8c83fb0ae15f27734ce |
| https://git.kernel.org/stable/c/eb63357ef229fae061ce7ce2839d558681c42f1a |
| https://git.kernel.org/stable/c/685d03c3795378fca6a1b3d43581f7f1a3fc095f |
