CVE-2021-47205 Information

Description

In the Linux kernel the following vulnerability has been resolved:

clk: sunxi-ng: Unregister clocks/resets when unbinding

Currently unbinding a CCU driver unmaps the device’s MMIO region while leaving its clocks/resets and their providers registered. This can cause a page fault later when some clock operation tries to perform MMIO. Fix this by separating the CCU initialization from the memory allocation and then using a devres callback to unregister the clocks and resets.

This also fixes a memory leak of the struct ccu_reset and uses the correct owner (the specific platform driver) for the clocks and resets.

Early OF clock providers are never unregistered and limited error handling is possible so they are mostly unchanged. The error reporting is made more consistent by moving the message inside of_sunxi_ccu_probe.

Reference

https://git.kernel.org/stable/c/b5dd513daa70ee8f6d281a20bd28485ee9bb7db2 https://git.kernel.org/stable/c/9bec2b9c6134052994115d2d3374e96f2ccb9b9d