[gnome-directory-thumbnailer] core: Bail early if scaled pixbuf dimensions are zero

[Philip Withnall <pwithnall src gnome org>]

commit d121aea4a0c014e26b8758697adcb2e9f5bc0178
Author: Philip Withnall <philip tecnocode co uk>
Date:   Sun Apr 30 10:12:27 2017 +0100

    core: Bail early if scaled pixbuf dimensions are zero
    
    This is possible if the input image is huge in one dimension and tiny in
    the other, leading to a very small scale factor.
    
    Signed-off-by: Philip Withnall <philip tecnocode co uk>

 src/main.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/main.c b/src/main.c
index f0c2364..133a7ea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -571,6 +571,11 @@ main (int argc, char *argv[])
                        g_debug ("Scaling thumbnail from %u×%u to %u×%u with for output size %i with scaling 
factor %f.",
                                 original_width, original_height, scaled_width, scaled_height, output_size, 
scale);
 
+                       if (scaled_width == 0 || scaled_height == 0) {
+                               status = STATUS_ERROR_GENERATING_THUMBNAIL;
+                               goto done;
+                       }
+
                        scaled_pixbuf = gnome_desktop_thumbnail_scale_down_pixbuf (pixbuf, scaled_width, 
scaled_height);
                        g_object_unref (pixbuf);
                        pixbuf = scaled_pixbuf;  /* transfer ownership */