Bug/818 (#821)

* Partial #818, unused arg

* Partial #818, init var

* partail #818, fix va_args usage

* partail #818, handle f* calls and avoid possible call to malloc with negative values

* partail #818, prevent double free

* partail #818, resource leak if test fail

* partail #818, null deref fix

* partail #818, avoid double free on fp failure

* Partial #818, fix error msg

* Partial #818, leak on error

* Partial #818, null deref

* Partial #818, avoid possible negative index on failure

* partial #818, does not free if we return if requested new size overflow

* partial #818, avoid double free, free where the alloc happened

* partial #818, fix assert logic and test exp_size for <=0

* partial #818, fix assert logic for color idx test

* partial #818, new case for possible leak, improve logic

* partial #818, fix assert logic for color idx test

3 files changed, 37 insertions, 12 deletions

diff --git a/tests/gdimagecolorclosest/gdimagecolorclosest.c b/tests/gdimagecolorclosest/gdimagecolorclosest.c
index 4754a2c..f6fd742 100644
--- a/tests/gdimagecolorclosest/gdimagecolorclosest.c
+++ b/tests/gdimagecolorclosest/gdimagecolorclosest.c
@@ -26,7 +26,13 @@ int main()
 	im = gdImageCreate(5, 5);
 	c = gdImageColorAllocate(im, 255, 0, 255);
 	c = gdImageColorClosest(im, 255, 0, 255);
-	c = gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0);
+	c = gdTestAssert(c>=0) ?
+		gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0)
+		:
+		-1;
+
+
+
 	gdImageDestroy(im);
 	if (gdTestAssert(c==0xFF00FF) != 1) {
 		error = -1;
@@ -38,7 +44,10 @@ int main()
 		c = gdImageColorAllocate(im, 255, 0, 0);
 	}
 	c = gdImageColorClosest(im, 255, 0, 0);
-	c = gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0);
+	c = gdTestAssert(c>=0) ?
+		gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0)
+		:
+		-1;
 	gdImageDestroy(im);
 	if (gdTestAssert(c==0xFF0000) != 1) {
 		error = -1;
@@ -49,7 +58,10 @@ int main()
 		c = gdImageColorAllocate(im, 255, 0, 0);
 	}
 	c = gdImageColorClosest(im, 255, 0, 0);
-	c = gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0);
+	c = gdTestAssert(c>=0) ?
+		gdTrueColorAlpha(gdImageRed(im, c), gdImageGreen(im, c), gdImageBlue(im, c), 0)
+		:
+		-1;
 	gdImageDestroy(im);
 	if (gdTestAssert(c==0xFF0000) != 1) {
 		error = -1;
diff --git a/tests/gdimagecolorexact/gdimagecolorexact.c b/tests/gdimagecolorexact/gdimagecolorexact.c
index 54698df..055127b 100644
--- a/tests/gdimagecolorexact/gdimagecolorexact.c
+++ b/tests/gdimagecolorexact/gdimagecolorexact.c
@@ -36,8 +36,8 @@ int main()
 		if (gdTestAssert(color == 0xFF00FF) != 1) {
 			error = -1;
 		}
-	}
 
+	}
 	if (gdTestAssert(c2 == 1)) {
 		color = gdTrueColorAlpha(gdImageRed(im, c2), gdImageGreen(im, c2),
 								gdImageBlue(im, c2), 0);
@@ -56,6 +56,7 @@ int main()
 		error = -1;
 	}
 
+
 	gdImageDestroy(im);
 
 	return error;
diff --git a/tests/tiff/tiff_invalid_read.c b/tests/tiff/tiff_invalid_read.c
index 0d12918..3c87bcf 100644
--- a/tests/tiff/tiff_invalid_read.c
+++ b/tests/tiff/tiff_invalid_read.c
@@ -41,23 +41,35 @@ static size_t read_test_file(char **buffer, char *basename)
 {
     char *filename;
     FILE *fp;
-    size_t exp_size, act_size = -1;
+
+    size_t exp_size = 0, act_size = -1;
 
     filename = gdTestFilePath2("tiff", basename);
     fp = fopen(filename, "rb");
-    if (gdTestAssert(fp != NULL)) goto fail3;
+    if (!gdTestAssert(fp != NULL)) goto fail3;
 
-    if (fseek(fp, 0, SEEK_END) != 0) goto fail2;
+    if (fseek(fp, 0, SEEK_END) != 0) {
+        gdTestAssert(1==0); // only increase num failures used as return values in main
+        goto fail2;
+    }
 
     exp_size = ftell(fp);
-    if (gdTestAssert(exp_size <= 0)) goto fail2;
+    if (!gdTestAssert(exp_size > 0)) {
+        gdTestAssert(1==0); // only increase num failures used as return values in main
+        goto fail2;
+    }
 
-    if (fseek(fp, 0, SEEK_SET) != 0) goto fail2;
+    if (fseek(fp, 0, SEEK_SET) != 0) {
+        gdTestAssert(1==0); // only increase num failures used as return values in main
+        goto fail2;
+    }
 
     *buffer = malloc(exp_size);
-    if (gdTestAssert(*buffer != NULL)) goto fail2;
-    act_size = fread(*buffer, sizeof(**buffer), exp_size, fp);
-    gdTestAssert(act_size == exp_size);
+    if (gdTestAssert(*buffer != NULL)) {
+        act_size = fread(*buffer, sizeof(**buffer), exp_size, fp);
+        gdTestAssert(act_size == exp_size);
+    }
+
 
 fail2:
     fclose(fp);