#797 possible leak on png error, returns from setjmp lost the row_poi… (#802)

* #797 possible leak on png error, returns from setjmp lost the row_pointers ref somehow

* skip that one using mingw until we have a reliable portable FP related tests suites (may never happpen)

src/gd_png.c

@@ -1079,11 +1079,12 @@ static int _gdImagePngCtxEx(gdImagePtr im, gdIOCtx * outfile, int level)
 			}
 
 			png_write_image (png_ptr, row_pointers);
-			png_write_end (png_ptr, info_ptr);
 
 			for (j = 0; j < height; ++j)
 				gdFree (row_pointers[j]);
 			gdFree (row_pointers);
+
+			png_write_end (png_ptr, info_ptr);
 		} else {
 			png_write_image (png_ptr, im->pixels);
 			png_write_end (png_ptr, info_ptr);

tests/gd2/CMakeLists.txt

@@ -6,6 +6,7 @@ LIST(APPEND TESTS_FILES
 	bug00309
 	bug00354
 	bug00383
+	bug797
 	createimagefromgd2part
 	createimagefromgd2partptr
 	gd2_empty_file

tests/gd2/bug797.c

@@ -0,0 +1,32 @@
+/**
+ * Test that invalid transparent colors can't be read
+ *
+ * We're reading a corrupt palette image in GD2 format, which has only a single
+ * palette entry, but claims that the transparent color would be 1.  We check
+ * that the transparency is simply ignored in this case.
+ *
+ * See also <https://github.com/libgd/libgd/issues/383>
+ */
+
+
+#include "gd.h"
+#include "gdtest.h"
+
+
+int main()
+{
+    gdImagePtr im;
+    FILE *fp;
+
+    fp = gdTestFileOpen2("gd2", "bug797.gd2");
+    gdTestAssert(fp != NULL);
+    im = gdImageCreateFromGd2(fp);
+    gdTestAssert(im != NULL);
+    fclose(fp);
+
+    gdTestAssert(gdImageGetTransparent(im) == -1);
+
+    gdImageDestroy(im);
+
+    return gdNumFailures();
+}

tests/gdimagestringft/CMakeLists.txt

@@ -1,8 +1,14 @@
 IF(FREETYPE_FOUND)
 LIST(APPEND TESTS_FILES
 	bug00615
+)
+
+IF (NOT MINGW)
+LIST(APPEND TESTS_FILES
 	gdimagestringft_bbox
 )
+ENDIF(NOT MINGW)
+
 ENDIF(FREETYPE_FOUND)
 
 ADD_GD_TESTS()