Sync with upstream

Even though libgd/libgd#492 is not a relevant bug fix for PHP, since
the binding doesn't use the `gdImage*Ptr()` functions at all, we're
porting the fix to stay in sync here.

3 files changed, 46 insertions, 9 deletions

diff --git a/ext/gd/libgd/gd_gif_out.c b/ext/gd/libgd/gd_gif_out.c
index 1f2a6b936a..2e1f38af70 100644
--- a/ext/gd/libgd/gd_gif_out.c
+++ b/ext/gd/libgd/gd_gif_out.c
@@ -97,12 +97,18 @@ static void cl_hash (register count_int chsize, GifCtx *ctx);
 static void char_init (GifCtx *ctx);
 static void char_out (int c, GifCtx *ctx);
 static void flush_char (GifCtx *ctx);
+
+static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out);
+
 void * gdImageGifPtr (gdImagePtr im, int *size)
 {
   void *rv;
   gdIOCtx *out = gdNewDynamicCtx (2048, NULL);
-  gdImageGifCtx (im, out);
-  rv = gdDPExtractData (out, size);
+	if (!_gdImageGifCtx(im, out)) {
+		rv = gdDPExtractData(out, size);
+	} else {
+		rv = NULL;
+	}
   out->gd_free (out);
   return rv;
 }
@@ -116,6 +122,12 @@ void gdImageGif (gdImagePtr im, FILE * outFile)
 
 void gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
 {
+	_gdImageGifCtx(im, out);
+}
+
+/* returns 0 on success, 1 on failure */
+static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
+{
 	gdImagePtr pim = 0, tim = im;
 	int interlace, BitsPerPixel;
 	interlace = im->interlace;
@@ -125,7 +137,7 @@ void gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
 			based temporary image. */
 		pim = gdImageCreatePaletteFromTrueColor(im, 1, 256);
 		if (!pim) {
-			return;
+			return 1;
 		}
 		tim = pim;
 	}
@@ -138,6 +150,8 @@ void gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
 		/* Destroy palette based temporary image. */
 		gdImageDestroy(	pim);
 	}
+
+    return 0;
 }
 
 static int
diff --git a/ext/gd/libgd/gd_jpeg.c b/ext/gd/libgd/gd_jpeg.c
index 8cf71fcbc9..ef46c4a22c 100644
--- a/ext/gd/libgd/gd_jpeg.c
+++ b/ext/gd/libgd/gd_jpeg.c
@@ -132,6 +132,7 @@ const char * gdJpegGetVersionString()
 	}
 }
 
+static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality);
 
 /*
  * Write IM to OUTFILE as a JFIF-formatted JPEG image, using quality
@@ -153,8 +154,11 @@ void *gdImageJpegPtr (gdImagePtr im, int *size, int quality)
 {
 	void *rv;
 	gdIOCtx *out = gdNewDynamicCtx (2048, NULL);
-	gdImageJpegCtx (im, out, quality);
-	rv = gdDPExtractData (out, size);
+	if (!_gdImageJpegCtx(im, out, quality)) {
+		rv = gdDPExtractData(out, size);
+	} else {
+		rv = NULL;
+	}
 	out->gd_free (out);
 
 	return rv;
@@ -164,6 +168,12 @@ void jpeg_gdIOCtx_dest (j_compress_ptr cinfo, gdIOCtx * outfile);
 
 void gdImageJpegCtx (gdImagePtr im, gdIOCtx * outfile, int quality)
 {
+	_gdImageJpegCtx(im, outfile, quality);
+}
+
+/* returns 0 on success, 1 on failure */
+static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
+{
 	struct jpeg_compress_struct cinfo;
 	struct jpeg_error_mgr jerr;
 	int i, j, jidx;
@@ -184,7 +194,7 @@ void gdImageJpegCtx (gdImagePtr im, gdIOCtx * outfile, int quality)
 		if (row) {
 			gdFree (row);
 		}
-		return;
+		return 1;
 	}
 
 	cinfo.err->error_exit = fatal_jpeg_error;
@@ -277,6 +287,7 @@ void gdImageJpegCtx (gdImagePtr im, gdIOCtx * outfile, int quality)
 	jpeg_finish_compress (&cinfo);
 	jpeg_destroy_compress (&cinfo);
 	gdFree (row);
+	return 0;
 }
 
 gdImagePtr gdImageCreateFromJpeg (FILE * inFile)
diff --git a/ext/gd/libgd/gd_wbmp.c b/ext/gd/libgd/gd_wbmp.c
index 55ced3443d..fd9edad2ca 100644
--- a/ext/gd/libgd/gd_wbmp.c
+++ b/ext/gd/libgd/gd_wbmp.c
@@ -82,6 +82,7 @@ int gd_getin (void *in)
 	return (gdGetC((gdIOCtx *) in));
 }
 
+static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out);
 
 /*      gdImageWBMPCtx
    **  --------------
@@ -94,13 +95,19 @@ int gd_getin (void *in)
  */
 void gdImageWBMPCtx (gdImagePtr image, int fg, gdIOCtx * out)
 {
+	_gdImageWBMPCtx(image, fg, out);
+}
+
+/* returns 0 on success, 1 on failure */
+static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
+{
 	int x, y, pos;
 	Wbmp *wbmp;
 
 	/* create the WBMP */
 	if ((wbmp = createwbmp (gdImageSX (image), gdImageSY (image), WBMP_WHITE)) == NULL) {
 		gd_error("Could not create WBMP");
-		return;
+		return 1;
 	}
 
 	/* fill up the WBMP structure */
@@ -116,7 +123,9 @@ void gdImageWBMPCtx (gdImagePtr image, int fg, gdIOCtx * out)
 
 	/* write the WBMP to a gd file descriptor */
 	if (writewbmp (wbmp, &gd_putout, out)) {
+		freewbmp(wbmp);
 		gd_error("Could not save WBMP");
+		return 1;
 	}
 	/* des submitted this bugfix: gdFree the memory. */
 	freewbmp(wbmp);
@@ -204,8 +213,11 @@ void * gdImageWBMPPtr (gdImagePtr im, int *size, int fg)
 {
 	void *rv;
 	gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
-	gdImageWBMPCtx(im, fg, out);
-	rv = gdDPExtractData(out, size);
+	if (!_gdImageWBMPCtx(im, fg, out)) {
+		rv = gdDPExtractData(out, size);
+	} else {
+		rv = NULL;
+	}
 	out->gd_free(out);
 
 	return rv;