From aba3db8ba159465ecec1089027a24835a6da9cc0 Mon Sep 17 00:00:00 2001
From: Pierre Joye <pierre.php@gmail.com>
Date: Tue, 28 Jun 2016 16:23:42 +0700
Subject: [PATCH] fix php bug 72339 (CVE-2016-5766), Integer Overflow in
 _gd2GetHeader() resulting in heap overflow

--- libgd2.orig/src/gd_gd2.c
+++ libgd2/src/gd_gd2.c
@@ -156,8 +156,11 @@ _gd2GetHeader (gdIOCtxPtr in, int *sx, i
 		nc = (*ncx) * (*ncy);
 		GD2_DBG (printf ("Reading %d chunk index entries\n", nc));
 		sidx = sizeof (t_chunk_info) * nc;
+		if (overflow2(sidx, nc)) {
+			goto fail1;
+		}
 		cidx = gdCalloc (sidx, 1);
-		if (!cidx) {
+		if (cidx == NULL) {
 			goto fail1;
 		}
 		for (i = 0; i < nc; i++) {