| 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-2024-27040: drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()' |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()' |
| |
| In the first if statement, we're checking if 'replay' is NULL. But in |
| the second if statement, we're not checking if 'replay' is NULL again |
| before calling replay->funcs->replay_set_power_opt(). |
| |
| if (replay == NULL && force_static) |
| return false; |
| |
| ... |
| |
| if (link->replay_settings.replay_feature_enabled && |
| replay->funcs->replay_set_power_opt) { |
| replay->funcs->replay_set_power_opt(replay, *power_opts, panel_inst); |
| link->replay_settings.replay_power_opt_active = *power_opts; |
| } |
| |
| If 'replay' is NULL, this will cause a null pointer dereference. |
| |
| Fixes the below found by smatch: |
| drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_edp_panel_control.c:895 edp_set_replay_allow_active() error: we previously assumed 'replay' could be null (see line 887) |
| |
| The Linux kernel CVE team has assigned CVE-2024-27040 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit c7ddc0a800bc9f681a18c3bdd9f06b61adfabc11 and fixed in 6.6.23 with commit f610c46771ef1047e46d61807aa7c69cd29e63d8 |
| Issue introduced in 6.6 with commit c7ddc0a800bc9f681a18c3bdd9f06b61adfabc11 and fixed in 6.7.11 with commit e7cadd5d3a8ffe334d0229ba9eda4290138d56e7 |
| Issue introduced in 6.6 with commit c7ddc0a800bc9f681a18c3bdd9f06b61adfabc11 and fixed in 6.8.2 with commit d0e94f4807ff0df66cf447d6b4bbb8ac830e99c3 |
| Issue introduced in 6.6 with commit c7ddc0a800bc9f681a18c3bdd9f06b61adfabc11 and fixed in 6.9 with commit f6aed043ee5d75b3d1bfc452b1a9584b63c8f76b |
| |
| 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-2024-27040 |
| 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/dc/link/protocols/link_edp_panel_control.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/f610c46771ef1047e46d61807aa7c69cd29e63d8 |
| https://git.kernel.org/stable/c/e7cadd5d3a8ffe334d0229ba9eda4290138d56e7 |
| https://git.kernel.org/stable/c/d0e94f4807ff0df66cf447d6b4bbb8ac830e99c3 |
| https://git.kernel.org/stable/c/f6aed043ee5d75b3d1bfc452b1a9584b63c8f76b |
