kernel: tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets

In the Linux kernel, the following vulnerability has been resolved: tcp: defer shutdownSENDSHUTDOWN for TCPSYNRECV sockets TCPSYNRECV state is really special, it is only used by cross-syn connections, mostly used by fuzzers. In the following crash 1, syzbot managed to trigger a divide by zero in...