| 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-2021-47364: comedi: Fix memory leak in compat_insnlist() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| comedi: Fix memory leak in compat_insnlist() |
| |
| `compat_insnlist()` handles the 32-bit version of the `COMEDI_INSNLIST` |
| ioctl (whenwhen `CONFIG_COMPAT` is enabled). It allocates memory to |
| temporarily hold an array of `struct comedi_insn` converted from the |
| 32-bit version in user space. This memory is only being freed if there |
| is a fault while filling the array, otherwise it is leaked. |
| |
| Add a call to `kfree()` to fix the leak. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47364 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit b8d47d8813055ce38c0d2ad913d5462017e52692 and fixed in 5.10.70 with commit 8d6a21e4cd6a319b0662cbe4ad6199e276ac776a |
| Issue introduced in 5.8 with commit b8d47d8813055ce38c0d2ad913d5462017e52692 and fixed in 5.14.9 with commit f217b6c1e28ed0b353634ce4d92a155b80bd1671 |
| Issue introduced in 5.8 with commit b8d47d8813055ce38c0d2ad913d5462017e52692 and fixed in 5.15 with commit bb509a6ffed2c8b0950f637ab5779aa818ed1596 |
| |
| 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-2021-47364 |
| 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: |
| drivers/comedi/comedi_fops.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/8d6a21e4cd6a319b0662cbe4ad6199e276ac776a |
| https://git.kernel.org/stable/c/f217b6c1e28ed0b353634ce4d92a155b80bd1671 |
| https://git.kernel.org/stable/c/bb509a6ffed2c8b0950f637ab5779aa818ed1596 |
