Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 2b5622cf4ee218b6f98d31dbf3fbd44b9b6bd675; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 36cb00c33bd83e7ce31b5a9f1f7c70db0cb7776c; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 30b7c63af50fe1464e7582a37de1ca4bd030ecc1; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 7afb8db47c4f107bce89cfe5115fb31ba7c94665; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 97edf3fd9a46ea89a167966991c0449cfa07b36f; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 08a59c28c2bdbcd655e99526c86a41dc83834283; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 6218c0533a72235ec9c5f41b812c63d963bd4a3e; affected a39a6405d5f949bc651694028a55d74c514ef1f9 before 9c48a53685040bb0de45a640b34055cbbfc69d4f |
| Linux / Linux | affected 4.4; unaffected 0 before 4.4; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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