CVE-2025-40148

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions<br /> <br /> The function dc_stream_set_cursor_attributes() currently dereferences<br /> the `stream` pointer and nested members `stream-&gt;ctx-&gt;dc-&gt;current_state`<br /> without checking for NULL.<br /> <br /> All callers of these functions, such as in<br /> `dcn30_apply_idle_power_optimizations()` and<br /> `amdgpu_dm_plane_handle_cursor_update()`, already perform NULL checks<br /> before calling these functions.<br /> <br /> Fixes below:<br /> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:336 dc_stream_program_cursor_attributes()<br /> error: we previously assumed &amp;#39;stream&amp;#39; could be null (see line 334)<br /> <br /> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c<br /> 327 bool dc_stream_program_cursor_attributes(<br /> 328 struct dc_stream_state *stream,<br /> 329 const struct dc_cursor_attributes *attributes)<br /> 330 {<br /> 331 struct dc *dc;<br /> 332 bool reset_idle_optimizations = false;<br /> 333<br /> 334 dc = stream ? stream-&gt;ctx-&gt;dc : NULL;<br /> ^^^^^^<br /> The old code assumed stream could be NULL.<br /> <br /> 335<br /> --&gt; 336 if (dc_stream_set_cursor_attributes(stream, attributes)) {<br /> ^^^^^^<br /> The refactor added an unchecked dereference.<br /> <br /> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c<br /> 313 bool dc_stream_set_cursor_attributes(<br /> 314 struct dc_stream_state *stream,<br /> 315 const struct dc_cursor_attributes *attributes)<br /> 316 {<br /> 317 bool result = false;<br /> 318<br /> 319 if (dc_stream_check_cursor_attributes(stream, stream-&gt;ctx-&gt;dc-&gt;current_state, attributes)) {<br /> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Here.<br /> This function used to check for if stream as NULL and return false at<br /> the start. Probably we should add that back.