clk: qcom: gdsc: tear down per-domain genpds in gdsc_unregister()

Summary

In the Linux kernel, the following vulnerability has been resolved: clk: qcom: gdsc: tear down per-domain genpds in gdsc_unregister() gdsc_unregister() removes the OF provider entry and tears down the parent/subdomain wiring, but never calls pm_genpd_remove() on the individual generic_pm_domain structures registered by gdsc_init(): void gdsc_unregister(struct gdsc_desc *desc) { struct device *dev = desc->dev; size_t num = desc->num; gdsc_pm_subdomain_remove(desc, num); of_genpd_del_provider(dev->of_node); } That leaves dangling entries on the global gpd_list. After a provider unbind/rebind cycle (deferred-probe replay during early boot, real module unload of a clk driver that owns GDSCs, or an OF-overlay tear- down) the next gdsc_init() will end up trying to re-register a name that is still in the list and pm_genpd_init() returns -EEXIST. While we are here, flip the order so the consumer-facing OF provider entry is the first thing removed -- otherwise a fresh of_genpd_get_from_provider() call racing with the teardown could attach to a domain that is mid-removal. Iterate the scs[] array and pm_genpd_remove() each registered domain after the subdomain links are torn down. The regulators stay devm- managed (devm_regulator_get_optional() in gdsc_register()), so the release happens automatically when the underlying device is unbound; just the genpd accounting needs to be undone explicitly.

Timeline

1. Sep 17, 2026, 4:11 PM UTCCVE published
2. Oct 19, 2026, 9:06 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 418d2f0a32b2a9ceb656a88aa9139408a9b7b517; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 6333cbf7e86df9797b342ce64ae7d32ba46d8d10; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in cfe16d993c578f6b17e0171a8dfd68f6fdfcfb24; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 0f4733f5fc6b6b62750619f30c18730922a1dbdb; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 6b9228a43963bcd4db92deb467375345132c29b3; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in f60f495858379dc70e87c6898d761a9db98739ff; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 40bd77fa2857ccfa77b885b77d44cea406f24a4c; From 45dd0e55317ccb27fe8eae639275c2b3a2fb52e5 · fixed in 86b23609d5e17a770d03037e53c6a443e742a6e6

• Linux Linux

  4.4

• KernelLinux

  From 4.4.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8