| From bippy-7c5fe7eed585 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-2024-26729: drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv |
| |
| Fixes potential null pointer dereference warnings in the |
| dc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up() |
| functions. |
| |
| In both functions, the 'dc_dmub_srv' variable was being dereferenced |
| before it was checked for null. This could lead to a null pointer |
| dereference if 'dc_dmub_srv' is null. The fix is to check if |
| 'dc_dmub_srv' is null before dereferencing it. |
| |
| Thus moving the null checks for 'dc_dmub_srv' to the beginning of the |
| functions to ensure that 'dc_dmub_srv' is not null when it is |
| dereferenced. |
| |
| Found by smatch & thus fixing the below: |
| drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128) |
| drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check 'dc_dmub_srv' (see line 1164) |
| |
| The Linux kernel CVE team has assigned CVE-2024-26729 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit 65138eb72e1fc687be49932b9a45325598ffa01c and fixed in 6.7.7 with commit 351080ba3414c96afff0f1338b4aeb2983195b80 |
| Issue introduced in 6.7 with commit 65138eb72e1fc687be49932b9a45325598ffa01c and fixed in 6.8 with commit d2b48f340d9e4a8fbeb1cdc84cd8da6ad143a907 |
| |
| 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-2024-26729 |
| 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/dc_dmub_srv.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/351080ba3414c96afff0f1338b4aeb2983195b80 |
| https://git.kernel.org/stable/c/d2b48f340d9e4a8fbeb1cdc84cd8da6ad143a907 |
