| 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-2021-47116: ext4: fix memory leak in ext4_mb_init_backend on error path. |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ext4: fix memory leak in ext4_mb_init_backend on error path. |
| |
| Fix a memory leak discovered by syzbot when a file system is corrupted |
| with an illegally large s_log_groups_per_flex. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47116 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.43 with commit 2050c6e5b161e5e25ce3c420fef58b24fa388a49 |
| Fixed in 5.12.10 with commit 04fb2baa0b147f51db065a1b13a11954abe592d0 |
| Fixed in 5.13 with commit a8867f4e3809050571c98de7a2d465aff5e4daf5 |
| |
| 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-2021-47116 |
| 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/ext4/mballoc.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/2050c6e5b161e5e25ce3c420fef58b24fa388a49 |
| https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0 |
| https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5 |
