| 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-2021-47362: drm/amd/pm: Update intermediate power state for SI |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/pm: Update intermediate power state for SI |
| |
| Update the current state as boot state during dpm initialization. |
| During the subsequent initialization, set_power_state gets called to |
| transition to the final power state. set_power_state refers to values |
| from the current state and without current state populated, it could |
| result in NULL pointer dereference. |
| |
| For ex: on platforms where PCI speed change is supported through ACPI |
| ATCS method, the link speed of current state needs to be queried before |
| deciding on changing to final power state's link speed. The logic to query |
| ATCS-support was broken on certain platforms. The issue became visible |
| when broken ATCS-support logic got fixed with commit |
| f9b7f3703ff9 ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)"). |
| |
| Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1698 |
| |
| The Linux kernel CVE team has assigned CVE-2021-47362 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.70 with commit 68d4fbe6220cd1f3d07cab0a4901e62f8c12cc68 |
| Fixed in 5.14.9 with commit 06a18e64256f7aecb5a27df02faa3568fcd3c105 |
| Fixed in 5.15 with commit ab39d3cef526ba09c4c6923b4cd7e6ec1c5d4faa |
| |
| 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-2021-47362 |
| 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/pm/powerplay/si_dpm.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/68d4fbe6220cd1f3d07cab0a4901e62f8c12cc68 |
| https://git.kernel.org/stable/c/06a18e64256f7aecb5a27df02faa3568fcd3c105 |
| https://git.kernel.org/stable/c/ab39d3cef526ba09c4c6923b4cd7e6ec1c5d4faa |
