From a93eac0e843148dc2d631c3ba80af17e9c8c860f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A1bio=20Cabral=20Pacheco?= <fcabralpacheco@gmail.com>
Date: Fri, 20 Dec 2019 12:03:33 -0300
Subject: [PATCH] Fix potential NULL pointer dereference in gdImageClone()
---
src/gd.c | 9 +--------
tests/gdimageclone/CMakeLists.txt | 1 +
tests/gdimageclone/Makemodule.am | 3 ++-
tests/gdimageclone/style.c | 30 ++++++++++++++++++++++++++++++
5 files changed, 35 insertions(+), 9 deletions(-)
create mode 100644 tests/gdimageclone/style.c
diff --git a/src/gd.c b/src/gd.c
index 592a0286..d564d1f9 100644
--- a/src/gd.c
+++ b/src/gd.c
@@ -2865,14 +2865,6 @@ BGD_DECLARE(gdImagePtr) gdImageClone (gdImagePtr src) {
}
}
- if (src->styleLength > 0) {
- dst->styleLength = src->styleLength;
- dst->stylePos = src->stylePos;
- for (i = 0; i < src->styleLength; i++) {
- dst->style[i] = src->style[i];
- }
- }
-
dst->interlace = src->interlace;
dst->alphaBlendingFlag = src->alphaBlendingFlag;
@@ -2907,6 +2899,7 @@ BGD_DECLARE(gdImagePtr) gdImageClone (gdImagePtr src) {
if (src->style) {
gdImageSetStyle(dst, src->style, src->styleLength);
+ dst->stylePos = src->stylePos;
}
for (i = 0; i < gdMaxColors; i++) {
diff --git a/tests/gdimageclone/CMakeLists.txt b/tests/gdimageclone/CMakeLists.txt
index e6ccc318..662f4e96 100644
--- a/tests/gdimageclone/CMakeLists.txt
+++ b/tests/gdimageclone/CMakeLists.txt
@@ -1,5 +1,6 @@
LIST(APPEND TESTS_FILES
bug00300
+ style
)
ADD_GD_TESTS()
diff --git a/tests/gdimageclone/Makemodule.am b/tests/gdimageclone/Makemodule.am
index 4b1b54c0..51abf5c1 100644
--- a/tests/gdimageclone/Makemodule.am
+++ b/tests/gdimageclone/Makemodule.am
@@ -1,5 +1,6 @@
libgd_test_programs += \
- gdimageclone/bug00300
+ gdimageclone/bug00300 \
+ gdimageclone/style
EXTRA_DIST += \
gdimageclone/CMakeLists.txt
diff --git a/tests/gdimageclone/style.c b/tests/gdimageclone/style.c
new file mode 100644
index 00000000..c2b246ed
--- /dev/null
+++ b/tests/gdimageclone/style.c
@@ -0,0 +1,30 @@
+/**
+ * Cloning an image should exactly reproduce all style related data
+ */
+
+
+#include <string.h>
+#include "gd.h"
+#include "gdtest.h"
+
+
+int main()
+{
+ gdImagePtr im, clone;
+ int style[] = {0, 0, 0};
+
+ im = gdImageCreate(8, 8);
+ gdImageSetStyle(im, style, sizeof(style)/sizeof(style[0]));
+
+ clone = gdImageClone(im);
+ gdTestAssert(clone != NULL);
+
+ gdTestAssert(clone->styleLength == im->styleLength);
+ gdTestAssert(clone->stylePos == im->stylePos);
+ gdTestAssert(!memcmp(clone->style, im->style, sizeof(style)/sizeof(style[0])));
+
+ gdImageDestroy(clone);
+ gdImageDestroy(im);
+
+ return gdNumFailures();
+}
