{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "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's possible that mtk_crtc->event is NULL in\nmtk_drm_crtc_finish_page_flip().\n\npending_needs_vblank value is set by mtk_crtc->event, but in\nmtk_drm_crtc_atomic_flush(), it's 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->event is not null,\n                                  step 1:\n                                  mtk_drm_crtc_atomic_flush:\n                                  mtk_drm_crtc_update_config(\n                                      !!mtk_crtc->event)\nstep 2:\nmtk_crtc_ddp_irq ->\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc->event 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 ->\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's more\nefficient to just check if mtk_crtc->event is null before use."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/gpu/drm/mediatek/mtk_drm_crtc.c"
               ],
               "versions": [
                  {
                     "version": "119f5173628a",
                     "lessThan": "accdac6b71d5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "dfde84cc6c58",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "4688be96d20f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "9beec711a172",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "d2bd30c71047",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "a3dd12b64ae8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "9acee29a38b4",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "3fc88b246a2f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "119f5173628a",
                     "lessThan": "c958e86e9cc1",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/gpu/drm/mediatek/mtk_drm_crtc.c"
               ],
               "versions": [
                  {
                     "version": "4.7",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.7",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.311",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.273",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.214",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.153",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.83",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.23",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.11",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.2",
                     "lessThanOrEqual": "6.8.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e"
            },
            {
               "url": "https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731"
            },
            {
               "url": "https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49"
            },
            {
               "url": "https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340"
            },
            {
               "url": "https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7"
            },
            {
               "url": "https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a"
            },
            {
               "url": "https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710"
            },
            {
               "url": "https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535"
            },
            {
               "url": "https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b"
            }
         ],
         "title": "drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26874",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}