# CVE-2024-49916: drm/amd/display: Add NULL check for clk_mgr and clk_mgr->funcs in dcn401_init_hw

CVE-2024-49916 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49916, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49916
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49916

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Add NULL check for clk_mgr and clk_mgr->funcs in dcn401_init_hw  This commit addresses a potential null pointer dereference issue in the `dcn401_init_hw` function. The issue could occur when `dc->clk_mgr` or `dc->clk_mgr->funcs` is null.  The fix adds a check to ensure `dc->clk_mgr` and `dc->clk_mgr->funcs` is not null before accessing its functions. This prevents a potential null pointer dereference.  Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn401/dcn401_hwseq.c:416 dcn401_init_hw() error: we previously assumed 'dc->clk_mgr' could be null (see line 225)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49916](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49916.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49916](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49916.md) | Oct 21, 2024 |

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