| From bippy-1.2.0 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-2022-49168: btrfs: do not clean up repair bio if submit fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| btrfs: do not clean up repair bio if submit fails |
| |
| The submit helper will always run bio_endio() on the bio if it fails to |
| submit, so cleaning up the bio just leads to a variety of use-after-free |
| and NULL pointer dereference bugs because we race with the endio |
| function that is cleaning up the bio. Instead just return BLK_STS_OK as |
| the repair function has to continue to process the rest of the pages, |
| and the endio for the repair bio will do the appropriate cleanup for the |
| page that it was given. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49168 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.15.184 with commit 7170875083254b51fcc5d67f96640977083f481e |
| Fixed in 5.16.19 with commit e76c78c48902dae6fa612749f59162bca0a79e0b |
| Fixed in 5.17.2 with commit d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14 |
| Fixed in 5.18 with commit 8cbc3001a3264d998d6b6db3e23f935c158abd4d |
| |
| 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-2022-49168 |
| 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/extent_io.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/7170875083254b51fcc5d67f96640977083f481e |
| https://git.kernel.org/stable/c/e76c78c48902dae6fa612749f59162bca0a79e0b |
| https://git.kernel.org/stable/c/d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14 |
| https://git.kernel.org/stable/c/8cbc3001a3264d998d6b6db3e23f935c158abd4d |
