{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47720",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-47720"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "drm/amd/display: Add null check for set_output_gamma in dcn30_set_output_transfer_func",
  "details": "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 }",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.113",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-47720"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/44948d3cb943602ba4a0b5ed3c91ae0525838fb1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ddf9ff244d704e1903533f7be377615ed34b83e7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}