CVE-2026-31544 firmware: arm_scmi: Fix NULL dereference on notify error path

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/firmware/arm_scmi/notify.c"
    ],
    "versions": [
      {
        "version": "b5daf93b809d13a194f8a8eeacfab1cfa241bbc3",
        "lessThan": "70d9bd9a2e683afe6200b0c20af22f06f1a199a4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b5daf93b809d13a194f8a8eeacfab1cfa241bbc3",
        "lessThan": "8414d2800c34528467df23ce6192c254a73e4459",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b5daf93b809d13a194f8a8eeacfab1cfa241bbc3",
        "lessThan": "555317d6100164748f7d09f80142739bd29f0cda",
        "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/firmware/arm_scmi/notify.c"
    ],
    "versions": [
      {
        "version": "6.17",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.17",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.20",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.10",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]