imgconverter: use more meaningful error for empty icon image

(cherry picked from commit 6e69ce2234)
2015-07-07 23:12:56 +02:00 · 2015-07-07 23:12:56 +02:00 · 5c6ad4c669
commit 5c6ad4c669
parent 6e4fa03459
1 changed files with 2 additions and 0 deletions
--- a/core/imgconverter.py
+++ b/core/imgconverter.py
@ -115,6 +115,8 @@ get_from_stream(), get_from_vm(), get_xdg_icon_from_vm(), get_through_dvm()'''
        maxhdrlen = imghdrlen(max_width, max_height)

        untrusted_header = stream.readline(maxhdrlen)
+        if len(untrusted_header) == 0:
+            raise ValueError('No icon received')
        if not re_imghdr.match(untrusted_header):
            raise ValueError('Image format violation')
        header = untrusted_header