| 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-2022-48846: block: release rq qos structures for queue without disk |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| block: release rq qos structures for queue without disk |
| |
| blkcg_init_queue() may add rq qos structures to request queue, previously |
| blk_cleanup_queue() calls rq_qos_exit() to release them, but commit |
| 8e141f9eb803 ("block: drain file system I/O on del_gendisk") |
| moves rq_qos_exit() into del_gendisk(), so memory leak is caused |
| because queues may not have disk, such as un-present scsi luns, nvme |
| admin queue, ... |
| |
| Fixes the issue by adding rq_qos_exit() to blk_cleanup_queue() back. |
| |
| BTW, v5.18 won't need this patch any more since we move |
| blkcg_init_queue()/blkcg_exit_queue() into disk allocation/release |
| handler, and patches have been in for-5.18/block. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48846 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 8e141f9eb803e209714a80aa6ec073893f94c526 and fixed in 5.15.31 with commit d4ad8736ac982111bb0be8306bf19c8207f6600e |
| Issue introduced in 5.15 with commit 8e141f9eb803e209714a80aa6ec073893f94c526 and fixed in 5.16.17 with commit 60c2c8e2ef3a3ec79de8cbc80a06ca0c21df8c29 |
| Issue introduced in 5.15 with commit 8e141f9eb803e209714a80aa6ec073893f94c526 and fixed in 5.17 with commit daaca3522a8e67c46e39ef09c1d542e866f85f3b |
| |
| 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-2022-48846 |
| 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: |
| block/blk-core.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/d4ad8736ac982111bb0be8306bf19c8207f6600e |
| https://git.kernel.org/stable/c/60c2c8e2ef3a3ec79de8cbc80a06ca0c21df8c29 |
| https://git.kernel.org/stable/c/daaca3522a8e67c46e39ef09c1d542e866f85f3b |
