master b9c43ac: Check decoding results in webp_load before using it

[Lars Ingebrigtsen]

branch: master
commit b9c43acdd6286bf51ab561aabe84e3dcd3a30eff
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Check decoding results in webp_load before using it
    
    * src/image.c (webp_load): Check whether we were able to decode
    the image before using it.
---
 src/image.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/image.c b/src/image.c
index 65bf22b..cd0f3f6 100644
--- a/src/image.c
+++ b/src/image.c
@@ -9039,6 +9039,12 @@ webp_load (struct frame *f, struct image *img)
     /* Linear [r0, g0, b0, r1, g1, b1, ...] order.  */
     decoded = WebPDecodeRGB (contents, size, &width, &height);
 
+  if (!decoded)
+    {
+      image_error ("Error when interpreting WebP image data");
+      goto webp_error1;
+    }
+
   if (!(width <= INT_MAX && height <= INT_MAX
        && check_image_size (f, width, height)))
     {