{"cve":"CVE-2024-47720","nvd":{"published":"2024-10-21T12:15:08.240","modified":"2026-06-17T07:57:37.520","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Add null check for set_output_gamma in dcn30_set_output_transfer_func\n\nThis commit adds a null check for the set_output_gamma function pointer\nin the  dcn30_set_output_transfer_func function. Previously,\nset_output_gamma was being checked for nullity at line 386, but then it\nwas being dereferenced without any nullity check at line 401. This\ncould potentially lead to a null pointer dereference error if\nset_output_gamma is indeed null.\n\nTo fix this, we now ensure that set_output_gamma is not null before\ndereferencing it. We do this by adding a nullity check for\nset_output_gamma before the call to set_output_gamma at line 401. If\nset_output_gamma is null, we log an error message and do not call the\nfunction.\n\nThis fix prevents a potential null pointer dereference error.\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c:401 dcn30_set_output_transfer_func()\nerror: we previously assumed 'mpc->funcs->set_output_gamma' could be null (see line 386)\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c\n    373 bool dcn30_set_output_transfer_func(struct dc *dc,\n    374                                 struct pipe_ctx *pipe_ctx,\n    375                                 const struct dc_stream_state *stream)\n    376 {\n    377         int mpcc_id = pipe_ctx->plane_res.hubp->inst;\n    378         struct mpc *mpc = pipe_ctx->stream_res.opp->ctx->dc->res_pool->mpc;\n    379         const struct pwl_params *params = NULL;\n    380         bool ret = false;\n    381\n    382         /* program OGAM or 3DLUT only for the top pipe*/\n    383         if (pipe_ctx->top_pipe == NULL) {\n    384                 /*program rmu shaper and 3dlut in MPC*/\n    385                 ret = dcn30_set_mpc_shaper_3dlut(pipe_ctx, stream);\n    386                 if (ret == false && mpc->funcs->set_output_gamma) {\n                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ If this is NULL\n\n    387                         if (stream->out_transfer_func.type == TF_TYPE_HWPWL)\n    388                                 params = &stream->out_transfer_func.pwl;\n    389                         else if (pipe_ctx->stream->out_transfer_func.type ==\n    390                                         TF_TYPE_DISTRIBUTED_POINTS &&\n    391                                         cm3_helper_translate_curve_to_hw_format(\n    392                                         &stream->out_transfer_func,\n    393                                         &mpc->blender_params, false))\n    394                                 params = &mpc->blender_params;\n    395                          /* there are no ROM LUTs in OUTGAM */\n    396                         if (stream->out_transfer_func.type == TF_TYPE_PREDEFINED)\n    397                                 BREAK_TO_DEBUGGER();\n    398                 }\n    399         }\n    400\n--> 401         mpc->funcs->set_output_gamma(mpc, mpcc_id, params);\n                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Then it will crash\n\n    402         return ret;\n    403 }","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2","https://git.kernel.org/stable/c/44948d3cb943602ba4a0b5ed3c91ae0525838fb1","https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a","https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e","https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:56:33.105311382+00:00"},"epss":{"cve":"CVE-2024-47720","score":0.0022,"percentile":0.12503,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}