CVE-2024-26747

In the Linux kernel, the following vulnerability has been resolved:

usb: roles: fix NULL pointer issue when put module's reference

In current design, usb role class driver will get usbroleswitch parent's module reference after the user get usbroleswitch device and put the reference after the user put the usbroleswitch device. However, the parent device of usbroleswitch may be removed before the user put the usbroleswitch. If so, then, NULL pointer issue will be met when the user put the parent module's reference.

This will save the module pointer in structure of usbroleswitch. Then, we don't need to find module by iterating long relations.