kernel: Null pointer dereference in fs/cifs/cifsencrypt.c:setup_ntlmv2_rsp() when empty TargetInfo is returned in NTLMSSP setup negotiation response allowing to crash client's kernel

A flaw was found in the Linux kernel's client-side implementation of the cifs protocol. This flaw allows an attacker controlling the server to kernel panic a client which has the CIFS server mounted...