drm/mediatek: Add error handling for old state CRTC in atomic_disable

{
  "id": "f7d1b3b8a264a075f432976405f1d39f915edf4af61e6e4ff424c942157bf17e",
  "url": "https://osv.dev/vulnerability/CVE-2025-39807",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/mediatek: Add error handling for old state CRTC in atomic_disable",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Add error handling for old state CRTC in atomic_disable Introduce error handling to address an issue where, after a hotplug event, the cursor continues to update. This situation can lead to a kernel panic due to accessing the NULL `old_state->crtc`. E,g. Unable to handle kernel NULL pointer dereference at virtual address Call trace: mtk_crtc_plane_disable+0x24/0x140 mtk_plane_atomic_update+0x8c/0xa8 drm_atomic_helper_commit_planes+0x114/0x2c8 drm_atomic_helper_commit_tail_rpm+0x4c/0x158 commit_tail+0xa0/0x168 drm_atomic_helper_commit+0x110/0x120 drm_atomic_commit+0x8c/0xe0 drm_atomic_helper_update_plane+0xd4/0x128 __setplane_atomic+0xcc/0x110 drm_mode_cursor_common+0x250/0x440 drm_mode_cursor_ioctl+0x44/0x70 drm_ioctl+0x264/0x5d8 __arm64_sys_ioctl+0xd8/0x510 invoke_syscall+0x6c/0xe0 do_el0_svc+0x68/0xe8 el0_svc+0x34/0x60 el0t_64_sync_handler+0x1c/0xf8 el0t_64_sync+0x180/0x188 Adding NULL pointer checks to ensure stability by preventing operations on an invalid CRTC state.",
    "evidence": "osv:CVE-2025-39807",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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    "severity": "medium",
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      "id": "CVE-2025-39807",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:42.906551656Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0c6b24d70da21201ed009a2aca740d2dfddc7ab5",
        "https://git.kernel.org/stable/c/7d5cc22efa44e0fe321ce195c71c3d7da211fbb2",
        "https://git.kernel.org/stable/c/9a94e9d8b50bcfe89693bc899a54d3866d86e973",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39807.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39807",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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  "source_id": "core-osv",
  "document_id": 510972,
  "published_at": "2025-09-16T13:00:10.408+00:00"
}