ghsa-fcg8-cxrp-mrx7
Vulnerability from github
Published
2025-12-24 15:30
Modified
2025-12-24 15:30
Details

In the Linux kernel, the following vulnerability has been resolved:

staging: media: tegra-video: fix device_node use after free

At probe time this code path is followed:

  • tegra_csi_init
  • tegra_csi_channels_alloc
    • for_each_child_of_node(node, channel) -- iterates over channels
    • automatically gets 'channel'
      • tegra_csi_channel_alloc()
      • saves into chan->of_node a pointer to the channel OF node
    • automatically gets and puts 'channel'
    • now the node saved in chan->of_node has refcount 0, can disappear
  • tegra_csi_channels_init
    • iterates over channels
    • tegra_csi_channel_init -- uses chan->of_node

After that, chan->of_node keeps storing the node until the device is removed.

of_node_get() the node and of_node_put() it during teardown to avoid any risk.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50745"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T13:16:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: media: tegra-video: fix device_node use after free\n\nAt probe time this code path is followed:\n\n * tegra_csi_init\n   * tegra_csi_channels_alloc\n     * for_each_child_of_node(node, channel) -- iterates over channels\n       * automatically gets \u0027channel\u0027\n         * tegra_csi_channel_alloc()\n           * saves into chan-\u003eof_node a pointer to the channel OF node\n       * automatically gets and puts \u0027channel\u0027\n       * now the node saved in chan-\u003eof_node has refcount 0, can disappear\n   * tegra_csi_channels_init\n     * iterates over channels\n       * tegra_csi_channel_init -- uses chan-\u003eof_node\n\nAfter that, chan-\u003eof_node keeps storing the node until the device is\nremoved.\n\nof_node_get() the node and of_node_put() it during teardown to avoid any\nrisk.",
  "id": "GHSA-fcg8-cxrp-mrx7",
  "modified": "2025-12-24T15:30:33Z",
  "published": "2025-12-24T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50745"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fd003d3c708c80350a815eaf37b8e1114b976cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5451efb2ca30f3c42b9efb8327ce35b62870dbd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6512c9498fcb97e7c760e3ef86b2272f2c0f765f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4d344163c3a7f90712525f931a6c016bbb35e18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce50c612458091d926ccb05d7db11d9f93532db2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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