CVE-2022-50745

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/5451efb2ca30f3c42b9efb8327ce35b62870dbd3
• https://git.kernel.org/stable/c/ce50c612458091d926ccb05d7db11d9f93532db2
• https://git.kernel.org/stable/c/6512c9498fcb97e7c760e3ef86b2272f2c0f765f
• https://git.kernel.org/stable/c/0fd003d3c708c80350a815eaf37b8e1114b976cf
• https://git.kernel.org/stable/c/c4d344163c3a7f90712525f931a6c016bbb35e18

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