CVE-2025-21660 ksmbd: fix unexpectedly changed path in ksmbd_vfs_kern_path_locked

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix unexpectedly changed path in ksmbdvfskernpathlocked When ksmbdvfskernpathlocked met an error and it is not the last entry, it will exit without restoring changed path buffer. But later this buffer may be used as the...