Avoid crash by access to cleared img->pixmap->data/img->mask->data (Bug#38774)

* src/image.c (prepare_image_for_display) [USE_CAIRO]: Call IMAGE_BACKGROUND
and IMAGE_BACKGROUND_TRANSPARENT.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/image.c b/src/image.c
index 5fe0d713e1b..e36253b3960 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1242,6 +1242,10 @@ prepare_image_for_display (struct frame *f, struct image *img)
       if (img->cr_data == NULL || (cairo_pattern_get_type (img->cr_data)
                                    != CAIRO_PATTERN_TYPE_SURFACE))
         {
+          /* Fill in the background/background_transparent field while
+             we have img->pixmap->data/img->mask->data.  */
+          IMAGE_BACKGROUND (img, f, img->pixmap);
+          IMAGE_BACKGROUND_TRANSPARENT (img, f, img->mask);
           cr_put_image_to_cr_data (img);
           if (img->cr_data == NULL)
             {