| 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-2024-44955: drm/amd/display: Don't refer to dc_sink in is_dsc_need_re_compute |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Don't refer to dc_sink in is_dsc_need_re_compute |
| |
| [Why] |
| When unplug one of monitors connected after mst hub, encounter null pointer dereference. |
| |
| It's due to dc_sink get released immediately in early_unregister() or detect_ctx(). When |
| commit new state which directly referring to info stored in dc_sink will cause null pointer |
| dereference. |
| |
| [how] |
| Remove redundant checking condition. Relevant condition should already be covered by checking |
| if dsc_aux is null or not. Also reset dsc_aux to NULL when the connector is disconnected. |
| |
| The Linux kernel CVE team has assigned CVE-2024-44955 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.6.64 with commit c7e65cab54a89f4df54110f0b44c4ade93d1a911 |
| Fixed in 6.10.5 with commit 39b217193729aa45eded8de24d9245468a0c0263 |
| Fixed in 6.11 with commit fcf6a49d79923a234844b8efe830a61f3f0584e4 |
| |
| 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-2024-44955 |
| 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_mst_types.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/c7e65cab54a89f4df54110f0b44c4ade93d1a911 |
| https://git.kernel.org/stable/c/39b217193729aa45eded8de24d9245468a0c0263 |
| https://git.kernel.org/stable/c/fcf6a49d79923a234844b8efe830a61f3f0584e4 |
