CVE-2024-40960 ipv6: prevent possible NULL dereference in rt6_probe()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/route.c"
    ],
    "versions": [
      {
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/route.c"
    ],
    "versions": [
      {
        "version": "2.6.17",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.17",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "4.19.317",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.4.279",
        "lessThanOrEqual": "5.4.*",
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      },
      {
        "version": "5.10.221",
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      },
      {
        "version": "5.15.162",
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      },
      {
        "version": "6.1.96",
        "lessThanOrEqual": "6.1.*",
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      },
      {
        "version": "6.6.36",
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      },
      {
        "version": "6.9.7",
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      {
        "version": "6.10",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]