Merge branch 'PHP-5.6' into PHP-7.0

NEWS

@@ -377,6 +377,8 @@ PHP                                                                        NEWS
   . Fixed bug #68712 (suspicious if-else statements). (cmb)
   . Fixed bug #72697 (select_colors write out-of-bounds). (Stas)
   . Fixed bug #72730 (imagegammacorrect allows arbitrary write access). (Stas)
+  . Fixed bug #72494 (imagecropauto out-of-bounds access). (Fernando, Pierre,
+    cmb)
 
 - Intl:
   . Fixed bug #72639 (Segfault when instantiating class that extends

ext/gd/libgd/gd_crop.c

@@ -243,6 +243,10 @@ gdImagePtr gdImageCropThreshold(gdImagePtr im, const unsigned int color, const f
 		return NULL;
 	}
 
+	if (!gdImageTrueColor(im) && color >= gdImageColorsTotal(im)) {
+		return NULL;
+	}
+
 	/* TODO: Add gdImageGetRowPtr and works with ptr at the row level
 	 * for the true color and palette images
 	 * new formats will simply work with ptr

ext/gd/tests/bug72494.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #72494 (imagecropauto out-of-bounds access)
+--SKIPIF--
+<?php
+if (!extension_loaded('gd')) die('skip gd extension not available');
+?>
+--FILE--
+<?php
+$im = imagecreate(10,10);
+imagecropauto($im, IMG_CROP_THRESHOLD, 0, 1337);
+?>
+===DONE===
+--EXPECTF--
+Warning: imagecropauto(): Color argument missing with threshold mode in %s on line %d
+===DONE===