| 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-2021-47253: drm/amd/display: Fix potential memory leak in DMUB hw_init |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix potential memory leak in DMUB hw_init |
| |
| [Why] |
| On resume we perform DMUB hw_init which allocates memory: |
| dm_resume->dm_dmub_hw_init->dc_dmub_srv_create->kzalloc |
| That results in memory leak in suspend/resume scenarios. |
| |
| [How] |
| Allocate memory for the DC wrapper to DMUB only if it was not |
| allocated before. |
| No need to reallocate it on suspend/resume. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47253 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.45 with commit 9e8c2af010463197315fa54a6c17e74988b5259c |
| Fixed in 5.12.12 with commit aa000f828e60ac15d6340f606ec4a673966f5b0b |
| Fixed in 5.13 with commit c5699e2d863f58221044efdc3fa712dd32d55cde |
| |
| 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-2021-47253 |
| 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/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.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/9e8c2af010463197315fa54a6c17e74988b5259c |
| https://git.kernel.org/stable/c/aa000f828e60ac15d6340f606ec4a673966f5b0b |
| https://git.kernel.org/stable/c/c5699e2d863f58221044efdc3fa712dd32d55cde |
