CVE-2025-38562 ksmbd: fix null pointer dereference error in generate_encryptionkey

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference error in generateencryptionkey If client send two session setups with krb5 authenticate to ksmbd, null pointer dereference error in generateencryptionkey could happen. sess-PreauthHashValue is...