{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-47720",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "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 }"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
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                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
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                                            "version_affected": "<",
                                            "version_name": "d99f13878d6f",
                                            "version_value": "44948d3cb943"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.9",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.9",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
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                                                    {
                                                        "version": "5.15.168",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
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                                                    {
                                                        "version": "6.1.113",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.54",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.10.13",
                                                        "lessThanOrEqual": "6.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.11.2",
                                                        "lessThanOrEqual": "6.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
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                                                    {
                                                        "version": "6.12-rc1",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
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        "reference_data": [
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                "refsource": "MISC",
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                "url": "https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a",
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                "name": "https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a"
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                "name": "https://git.kernel.org/stable/c/ddf9ff244d704e1903533f7be377615ed34b83e7"
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                "url": "https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9"
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                "url": "https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e"
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2"
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