oss-fuzz/projects/postgresql/add_fuzzers.diff

diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 825fd55107..f3e2dbbf20 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -105,6 +105,10 @@ int			PostAuthDelay = 0;
 /* Time between checks that the client is still connected. */
 int			client_connection_check_interval = 0;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+bool        fuzzer_first_run = true;
+#endif
+
 /* ----------------
  *		private typedefs etc
  * ----------------
@@ -454,10 +458,15 @@ ReadCommand(StringInfo inBuf)
 {
 	int			result;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    result = SocketBackend(inBuf);
+#else
+
 	if (whereToSendOutput == DestRemote)
 		result = SocketBackend(inBuf);
 	else
 		result = InteractiveBackend(inBuf);
+#endif
 	return result;
 }
 
@@ -3910,6 +3919,11 @@ PostgresMain(int argc, char *argv[],
 	bool		idle_in_transaction_timeout_enabled = false;
 	bool		idle_session_timeout_enabled = false;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+        if(fuzzer_first_run)
+                {
+#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
+
 	/* Initialize startup process environment if necessary. */
 	if (!IsUnderPostmaster)
 		InitStandaloneProcess(argv[0]);
@@ -4271,6 +4285,11 @@ PostgresMain(int argc, char *argv[],
 	if (!ignore_till_sync)
 		send_ready_for_query = true;	/* initially, or after error */
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+        fuzzer_first_run=false;
+            }
+#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
+
 	/*
 	 * Non-error queries loop here.
 	 */
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index a1ebe06d5b..dfa94013a0 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -594,7 +594,9 @@ errfinish(const char *filename, int lineno, const char *funcname)
 	}
 
 	/* Emit the message to the right places */
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 	EmitErrorReport();
+#endif
 
 	/* Now free up subsidiary data attached to stack entry, and release it */
 	if (edata->message)