cve-2024-26874
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2024-08-02 00:21
Severity
Summary
drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip\n\nIt\u0027s possible that mtk_crtc-\u003eevent is NULL in\nmtk_drm_crtc_finish_page_flip().\n\npending_needs_vblank value is set by mtk_crtc-\u003eevent, but in\nmtk_drm_crtc_atomic_flush(), it\u0027s is not guarded by the same\nlock in mtk_drm_finish_page_flip(), thus a race condition happens.\n\nConsider the following case:\n\nCPU1                              CPU2\nstep 1:\nmtk_drm_crtc_atomic_begin()\nmtk_crtc-\u003eevent is not null,\n                                  step 1:\n                                  mtk_drm_crtc_atomic_flush:\n                                  mtk_drm_crtc_update_config(\n                                      !!mtk_crtc-\u003eevent)\nstep 2:\nmtk_crtc_ddp_irq -\u003e\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc-\u003eevent set to null,\npending_needs_vblank set to false\nunlock\n                                  pending_needs_vblank set to true,\n\n                                  step 2:\n                                  mtk_crtc_ddp_irq -\u003e\n                                  mtk_drm_finish_page_flip called again,\n                                  pending_needs_vblank is still true\n                                  //null pointer\n\nInstead of guarding the entire mtk_drm_crtc_atomic_flush(), it\u0027s more\nefficient to just check if mtk_crtc-\u003eevent is null before use."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26874",
    "datePublished": "2024-04-17T10:27:33.278Z",
    "dateReserved": "2024-02-19T14:20:24.185Z",
    "dateUpdated": "2024-08-02T00:21:04.219Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26874\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T11:15:09.670\",\"lastModified\":\"2024-06-27T13:15:56.957\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip\\n\\nIt\u0027s possible that mtk_crtc-\u003eevent is NULL in\\nmtk_drm_crtc_finish_page_flip().\\n\\npending_needs_vblank value is set by mtk_crtc-\u003eevent, but in\\nmtk_drm_crtc_atomic_flush(), it\u0027s is not guarded by the same\\nlock in mtk_drm_finish_page_flip(), thus a race condition happens.\\n\\nConsider the following case:\\n\\nCPU1                              CPU2\\nstep 1:\\nmtk_drm_crtc_atomic_begin()\\nmtk_crtc-\u003eevent is not null,\\n                                  step 1:\\n                                  mtk_drm_crtc_atomic_flush:\\n                                  mtk_drm_crtc_update_config(\\n                                      !!mtk_crtc-\u003eevent)\\nstep 2:\\nmtk_crtc_ddp_irq -\u003e\\nmtk_drm_finish_page_flip:\\nlock\\nmtk_crtc-\u003eevent set to null,\\npending_needs_vblank set to false\\nunlock\\n                                  pending_needs_vblank set to true,\\n\\n                                  step 2:\\n                                  mtk_crtc_ddp_irq -\u003e\\n                                  mtk_drm_finish_page_flip called again,\\n                                  pending_needs_vblank is still true\\n                                  //null pointer\\n\\nInstead of guarding the entire mtk_drm_crtc_atomic_flush(), it\u0027s more\\nefficient to just check if mtk_crtc-\u003eevent is null before use.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/mediatek: corrige un fallo del puntero nulo en mtk_drm_crtc_finish_page_flip Es posible que mtk_crtc-\u0026gt;event sea NULL en mtk_drm_crtc_finish_page_flip(). El valor pendiente_needs_vblank lo establece mtk_crtc-\u0026gt;event, pero en mtk_drm_crtc_atomic_flush(), no est\u00e1 protegido por el mismo bloqueo en mtk_drm_finish_page_flip(), por lo que ocurre una condici\u00f3n de carrera. Considere el siguiente caso: CPU1 CPU2 paso 1: mtk_drm_crtc_atomic_begin() mtk_crtc-\u0026gt;event is not null, paso 1: mtk_drm_crtc_atomic_flush: mtk_drm_crtc_update_config( !!mtk_crtc-\u0026gt;event) paso 2: mtk_crtc_ddp_irq -\u0026gt; mtk_drm_finish _page_flip: bloquear mtk_crtc-\u0026gt;evento establecido en nulo, pendiente_needs_vblank configurado en falso desbloqueo pendiente_needs_vblank configurado en verdadero, paso 2: mtk_crtc_ddp_irq -\u0026gt; mtk_drm_finish_page_flip llamado nuevamente, pendiente_needs_vblank sigue siendo verdadero //puntero nulo En lugar de proteger todo el mtk_drm_crtc_atomic_flush(), es m\u00e1s eficiente simplemente verificar si mtk_crtc-\u0026gt;even t es nulo antes de su uso.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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