usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group The DisplayPort driver's sysfs nodes may be present to the userspace before typec_altmode_set_drvdata() completes in dp_altmode_probe. This means that a sysfs read can trigger a NULL pointer error by deferencing dp->hpd in hpd_show or dp->lock in pin_assignment_show, as dev_get_drvdata() returns NULL in those cases. Remove manual sysfs node creation in favor of adding attribute group as default for devices bound to the driver. The ATTRIBUTE_GROUPS() macro is not used here otherwise the path to the sysfs nodes is no longer compliant with the ABI.

References

• https://git.kernel.org/stable/c/6b989ea1c479533ab8dbfbeb1704c94b1d3320da
• https://git.kernel.org/stable/c/9794ffd9d0c39ee070fbd733f862bbe89b28ba33
• https://git.kernel.org/stable/c/f1c5ddaef506e3517dce338c08a60663b1521920
• https://git.kernel.org/stable/c/4a22aeac24d0d5f26ba741408e8b5a4be6dc5dc0
• https://git.kernel.org/stable/c/0ad011776c057ce881b7fd6d8c79ecd459c087e9
• https://git.kernel.org/stable/c/165376f6b23e9a779850e750fb2eb06622e5a531