# CVE-2024-49970: drm/amd/display: Implement bounds check for stream encoder creation in DCN401

CVE-2024-49970 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49970, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49970
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024
- Weakness: Improper Validation of Array Index
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49970

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Implement bounds check for stream encoder creation in DCN401  'stream_enc_regs' array is an array of dcn10_stream_enc_registers structures. The array is initialized with four elements, corresponding to the four calls to stream_enc_regs() in the array initializer. This means that valid indices for this array are 0, 1, 2, and 3.  The error message 'stream_enc_regs' 4 <= 5 below, is indicating that there is an attempt to access this array with an index of 5, which is out of bounds. This could lead to undefined behavior  Here, eng_id is used as an index to access the stream_enc_regs array. If eng_id is 5, this would result in an out-of-bounds access on the stream_enc_regs array.  Thus fixing Buffer overflow error in dcn401_stream_encoder_create  Found by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn401/dcn401_resource.c:1209 dcn401_stream_encoder_create() error: buffer overflow 'stream_enc_regs' 4 <= 5

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49970](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49970.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49970](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49970.md) | Oct 21, 2024 |

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