{"uuid": "ff71bd3d-c47c-43e0-be7a-cc5aaa2ca4d0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2024-47720", "type": "seen", "source": "https://t.me/cvedetector/8457", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2024-47720 - AMD display driver null pointer dereference vulnerability\", \n  \"Content\": \"CVE ID : CVE-2024-47720 \nPublished : Oct. 21, 2024, 12:15 p.m. | 41\u00a0minutes ago \nDescription : 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 } \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"21 Oct 2024\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2024-10-21T15:09:38.000000Z"}