| 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-2021-47289: ACPI: fix NULL pointer dereference |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ACPI: fix NULL pointer dereference |
| |
| Commit 71f642833284 ("ACPI: utils: Fix reference counting in |
| for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer |
| that was possibly NULL. That fails miserably, because that helper |
| inline function is not set up to handle that case. |
| |
| Just make acpi_dev_put() silently accept a NULL pointer, rather than |
| calling down to put_device() with an invalid offset off that NULL |
| pointer. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47289 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.139 with commit 38f54217b423c0101d03a00feec6fb8ec608b12e |
| Fixed in 5.10.57 with commit cae3fa3d8165761f3000f523b11cfa1cd35206bc |
| Fixed in 5.13.6 with commit ccf23a0888077a25a0793a746c3941db2a7562e4 |
| Fixed in 5.14 with commit fc68f42aa737dc15e7665a4101d4168aadb8e4c4 |
| |
| 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-2021-47289 |
| 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: |
| include/acpi/acpi_bus.h |
| |
| |
| 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/38f54217b423c0101d03a00feec6fb8ec608b12e |
| https://git.kernel.org/stable/c/cae3fa3d8165761f3000f523b11cfa1cd35206bc |
| https://git.kernel.org/stable/c/ccf23a0888077a25a0793a746c3941db2a7562e4 |
| https://git.kernel.org/stable/c/fc68f42aa737dc15e7665a4101d4168aadb8e4c4 |
