CVE-2024-47720drm/amd/display: Add null check for set_output_gamma in dcn30_set_output_transfer_func
- 5.5MediumCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add null check for set_output_gamma in dcn30_set_output_transfer_func This commit adds a null check for the set_output_gamma function pointer in the dcn30_set_output_transfer_func function. Previously, set_output_gamma was being checked for nullity at line 386, but then it was being dereferenced without any nullity check at line 401. This could potentially lead to a null pointer dereference error if set_output_gamma is indeed null. To fix this, we now ensure that set_output_gamma is not null before dereferencing it. We do this by adding a nullity check for set_output_gamma before the call to set_output_gamma at line 401. If set_output_gamma is null, we log an error message and do not call the function. This fix prevents a potential null pointer dereference error. drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c:401 dcn30_set_output_transfer_func() error: we previously assumed 'mpc->funcs->set_output_gamma' could be null (see line 386) drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c 373 bool dcn30_set_output_transfer_func(struct dc *dc, 374 struct pipe_ctx *pipe_ctx, 375 const struct dc_stream_state *stream) 376 { 377 int mpcc_id = pipe_ctx->plane_res.hubp->inst; 378 struct mpc *mpc = pipe_ctx->stream_res.opp->ctx->dc->res_pool->mpc; 379 const struct pwl_params *params = NULL; 380 bool ret = false; 381 382 /* program OGAM or 3DLUT only for the top pipe*/ 383 if (pipe_ctx->top_pipe == NULL) { 384 /*program rmu shaper and 3dlut in MPC*/ 385 ret = dcn30_set_mpc_shaper_3dlut(pipe_ctx, stream); 386 if (ret == false && mpc->funcs->set_output_gamma) { ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ If this is NULL 387 if (stream->out_transfer_func.type == TF_TYPE_HWPWL) 388 params = &stream->out_transfer_func.pwl; 389 else if (pipe_ctx->stream->out_transfer_func.type == 390 TF_TYPE_DISTRIBUTED_POINTS && 391 cm3_helper_translate_curve_to_hw_format( 392 &stream->out_transfer_func, 393 &mpc->blender_params, false)) 394 params = &mpc->blender_params; 395 /* there are no ROM LUTs in OUTGAM */ 396 if (stream->out_transfer_func.type == TF_TYPE_PREDEFINED) 397 BREAK_TO_DEBUGGER(); 398 } 399 } 400 --> 401 mpc->funcs->set_output_gamma(mpc, mpcc_id, params); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Then it will crash 402 return ret; 403 }
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 19 months later
· 19 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < 44948d3cb943602ba4a0b5ed3c91ae0525838fb1
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < 64886a4e6f1dce843c0889505cf0673b5211e16a
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < ddf9ff244d704e1903533f7be377615ed34b83e7
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < 84edd5a3f5fa6aafa4afcaf9f101f46426c620c9
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < 72ee32d0907364104fbcf4f68dd5ae63cd8eae9e
- affected d99f13878d6f9c286b13860d8bf0b4db9ffb189a – < 08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2
- affected 5.9
- unaffected < 5.9
- unaffected 5.15.168 – ≤ 5.15.*
- unaffected 6.1.113 – ≤ 6.1.*
- unaffected 6.6.54 – ≤ 6.6.*
- unaffected 6.10.13 – ≤ 6.10.*
- unaffected 6.11.2 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References7
- https://git.kernel.org/stable/c/44948d3cb943602ba4a0b5ed3c91ae0525838fb1 (opens in a new tab)
- https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a (opens in a new tab)
- https://git.kernel.org/stable/c/ddf9ff244d704e1903533f7be377615ed34b83e7 (opens in a new tab)
- https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9 (opens in a new tab)
- https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e (opens in a new tab)
- https://git.kernel.org/stable/c/08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-42639 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-47720)Record last updated .