CVE-2026-90126rtc: pcf8563: fix clock provider leak on unbind

Official description

In the Linux kernel, the following vulnerability has been resolved: rtc: pcf8563: fix clock provider leak on unbind pcf8563_clkout_register_clk() registers the CLKOUT clock provider with of_clk_add_provider(), but nothing ever unwinds it: there is no of_clk_del_provider() call and the driver has no remove callback. Each of_clk_add_provider() allocates a struct of_clk_provider, takes a reference on the OF node and adds an entry to the global of_clk_providers list, none of which is released when the device is unbound. Every bind/unbind (or module reload) therefore leaks a provider structure and an of_node reference. The clock itself is already device-managed (devm_clk_register()); only the provider registration was not. Use devm_of_clk_add_hw_provider() so the provider is removed automatically on unbind. Tie it to the parent i2c device, whose OF node carries the #clock-cells and clock-output-names properties (the RTC class device has no OF node of its own).

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675
• https://git.kernel.org/stable/c/36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c
• https://git.kernel.org/stable/c/30b7c63af50fe1464e7582a37de1ca4bd030ecc1
• https://git.kernel.org/stable/c/7afb8db47c4f107bce89cfe5115fb31ba7c94665
• https://git.kernel.org/stable/c/97edf3fd9a46ea89a167966991c0449cfa07b36f
• https://git.kernel.org/stable/c/08a59c28c2bdbcd655e99526c86a41dc83834283
• https://git.kernel.org/stable/c/6218c0533a72235ec9c5f41b812c63d963bd4a3e
• https://git.kernel.org/stable/c/9c48a53685040bb0de45a640b34055cbbfc69d4f