iscsi-isert: Avoid that reading the target_ip sysfs attribute triggers a kernel oops

conn->sock is set by the TCP/IP transport but not by the iSER transport.
Hence check the conn->sock pointer from common code before dereferencing it.

Reported-by: Doug Dumitru <doug@easyco.com>


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8051 d57e44dd-8a1f-0410-8b47-8ef2f437770f

iscsi-scst/kernel/conn.c

@@ -125,6 +125,9 @@ static ssize_t iscsi_get_target_ip(struct iscsi_conn *conn,
 
 	TRACE_ENTRY();
 
+	if (!conn->sock)
+		return -ENOENT;
+
 	sk = conn->sock->sk;
 	switch (sk->sk_family) {
 	case AF_INET: