From 123dd99c6a1ae2ef6fcb5547e51fa58e8c954b51 Mon Sep 17 00:00:00 2001
From: Carlos Garcia Campos <carlosgc@gnome.org>
Date: Fri, 8 Dec 2017 11:11:38 +0100
Subject: [PATCH 1/2] gxps-images: fix integer overflow in png decoder

---
 libgxps/gxps-images.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libgxps/gxps-images.c b/libgxps/gxps-images.c
index 98c7052..19cb1c0 100644
--- a/libgxps/gxps-images.c
+++ b/libgxps/gxps-images.c
@@ -286,7 +286,7 @@ gxps_images_create_from_png (GXPSArchive *zip,
 	}
 
 	stride = cairo_format_stride_for_width (format, png_width);
-	if (stride < 0) {
+	if (stride < 0 || png_height >= INT_MAX / stride) {
 		fill_png_error (error, image_uri, NULL);
 		g_object_unref (stream);
 		png_destroy_read_struct (&png, &info, NULL);
-- 
2.17.1