GHSA-6MJ8-3P38-3J38
Vulnerability from github – Published: 2024-10-21 12:30 – Updated: 2025-11-04 00:31In 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 }
{
"affected": [],
"aliases": [
"CVE-2024-47720"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-21T12:15:08Z",
"severity": "MODERATE"
},
"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 \u0027mpc-\u003efuncs-\u003eset_output_gamma\u0027 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-\u003eplane_res.hubp-\u003einst;\n 378 struct mpc *mpc = pipe_ctx-\u003estream_res.opp-\u003ectx-\u003edc-\u003eres_pool-\u003empc;\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-\u003etop_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 \u0026\u0026 mpc-\u003efuncs-\u003eset_output_gamma) {\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ If this is NULL\n\n 387 if (stream-\u003eout_transfer_func.type == TF_TYPE_HWPWL)\n 388 params = \u0026stream-\u003eout_transfer_func.pwl;\n 389 else if (pipe_ctx-\u003estream-\u003eout_transfer_func.type ==\n 390 TF_TYPE_DISTRIBUTED_POINTS \u0026\u0026\n 391 cm3_helper_translate_curve_to_hw_format(\n 392 \u0026stream-\u003eout_transfer_func,\n 393 \u0026mpc-\u003eblender_params, false))\n 394 params = \u0026mpc-\u003eblender_params;\n 395 /* there are no ROM LUTs in OUTGAM */\n 396 if (stream-\u003eout_transfer_func.type == TF_TYPE_PREDEFINED)\n 397 BREAK_TO_DEBUGGER();\n 398 }\n 399 }\n 400\n--\u003e 401 mpc-\u003efuncs-\u003eset_output_gamma(mpc, mpcc_id, params);\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Then it will crash\n\n 402 return ret;\n 403 }",
"id": "GHSA-6mj8-3p38-3j38",
"modified": "2025-11-04T00:31:37Z",
"published": "2024-10-21T12:30:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47720"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/08ae395ea22fb3d9b318c8bde28c0dfd2f5fa4d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/44948d3cb943602ba4a0b5ed3c91ae0525838fb1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64886a4e6f1dce843c0889505cf0673b5211e16a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/72ee32d0907364104fbcf4f68dd5ae63cd8eae9e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84edd5a3f5fa6aafa4afcaf9f101f46426c620c9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ddf9ff244d704e1903533f7be377615ed34b83e7"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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