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