Fix crash caused by NULL lookup when reporting IP address of failed

libpq connection, per report from Magnus.  This happens only on GIT
master and only on Win32 because that is the platform where "" maps to
an IP address (localhost).

diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b1523a6a893422af5df9bd25abbe6da9d554aa42..8d9400be0fc7c30f27a7ac949912d79ef7da4be3 100644 (file)
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -1031,7 +1031,8 @@ connectFailureMessage(PGconn *conn, int errorno)
                        strcpy(host_addr, "???");
 
                display_host_addr = (conn->pghostaddr == NULL) &&
-                       (strcmp(conn->pghost, host_addr) != 0);
+                                                       (conn->pghost != NULL) &&
+                                                       (strcmp(conn->pghost, host_addr) != 0);
 
                appendPQExpBuffer(&conn->errorMessage,
                                                  libpq_gettext("could not connect to server: %s\n"