Index: postgresql-9.4-9.4.12/src/backend/utils/adt/formatting.c
===================================================================
--- postgresql-9.4-9.4.12.orig/src/backend/utils/adt/formatting.c	2017-05-08 23:19:04.000000000 +0200
+++ postgresql-9.4-9.4.12/src/backend/utils/adt/formatting.c	2017-06-22 09:20:17.000000000 +0200
@@ -4173,12 +4173,12 @@
 		 (id == NUM_0 || id == NUM_9) ? "NUM_0/9" : id == NUM_DEC ? "NUM_DEC" : "???");
 #endif
 
+	if (*Np->inout_p == ' ')
+		Np->inout_p++;
+
 #define OVERLOAD_TEST	(Np->inout_p >= Np->inout + input_len)
 #define AMOUNT_TEST(_s) (input_len-(Np->inout_p-Np->inout) >= _s)
 
-	if (OVERLOAD_TEST)
-		return;
-
 	if (*Np->inout_p == ' ')
 		Np->inout_p++;
 
@@ -4316,7 +4316,7 @@
 		 * next char is not digit
 		 */
 		if (IS_LSIGN(Np->Num) && isread &&
-			(Np->inout_p + 1) < Np->inout + input_len &&
+			(Np->inout_p + 1) <= Np->inout + input_len &&
 			!isdigit((unsigned char) *(Np->inout_p + 1)))
 		{
 			int			x;