CVE-2023-53458 media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/media/pci/cx23885/cx23885-core.c",
      "drivers/media/pci/cx23885/cx23885-video.c"
    ],
    "versions": [
      {
        "version": "4d63a25c4523b5d18e5307897d56aff785f43bf5",
        "lessThan": "f0a06203f2fe63f04311467200c99c4ee1926578",
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      },
      {
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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/media/pci/cx23885/cx23885-core.c",
      "drivers/media/pci/cx23885/cx23885-video.c"
    ],
    "versions": [
      {
        "version": "3.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.18",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.113",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.30",
        "lessThanOrEqual": "6.1.*",
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      },
      {
        "version": "6.3.4",
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        "versionType": "semver"
      },
      {
        "version": "6.4",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]