ieee802154: ca8210: Fix a potential UAF in ca8210_probe

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ieee802154: ca8210: Fix a potential UAF in ca8210_probe If of_clk_add_provider() fails in ca8210_register_ext_clock(), it calls clk_unregister() to release priv->clk and returns an error. However, the caller ca8210_probe() then calls ca8210_remove(), where priv->clk is freed again in ca8210_unregister_ext_clock(). In this case, a use-after-free may happen in the second time we call clk_unregister(). Fix this by removing the first clk_unregister(). Also, priv->clk could be an error code on failure of clk_register_fixed_rate(). Use IS_ERR_OR_NULL to catch this case in ca8210_unregister_ext_clock().

References

• https://git.kernel.org/stable/c/28b68cba378e3e50a4082b65f262bc4f2c7c2add
• https://git.kernel.org/stable/c/cdb46be93c1f7bbf2c4649e9fc5fb147cfb5245d
• https://git.kernel.org/stable/c/85c2857ef90041f567ce98722c1c342c4d31f4bc
• https://git.kernel.org/stable/c/55e06850c7894f00d41b767c5f5665459f83f58f
• https://git.kernel.org/stable/c/84c6aa0ae5c4dc121f9996bb8fed46c80909d80e
• https://git.kernel.org/stable/c/217efe32a45249eb07dcd7197e8403de98345e66
• https://git.kernel.org/stable/c/becf5c147198f4345243c5df0c4f035415491640
• https://git.kernel.org/stable/c/f990874b1c98fe8e57ee9385669f501822979258