CVE-2022-50875 of: overlay: fix null pointer dereferencing in find_dup_cset_node_entry() and find_dup_cset_prop()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/of/overlay.c"
    ],
    "versions": [
      {
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  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/of/overlay.c"
    ],
    "versions": [
      {
        "version": "5.0",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.0",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.4.229",
        "lessThanOrEqual": "5.4.*",
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      {
        "version": "5.10.163",
        "lessThanOrEqual": "5.10.*",
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      },
      {
        "version": "5.15.86",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
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      {
        "version": "6.0.16",
        "lessThanOrEqual": "6.0.*",
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      {
        "version": "6.1.2",
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      {
        "version": "6.2",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]