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-rw-r--r--synapse/rest/media/v1/media_repository.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index 3cbeca503c..481ffee200 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -240,6 +240,9 @@ class MediaRepository(object):
         if t_method == "crop":
             t_len = thumbnailer.crop(t_path, t_width, t_height, t_type)
         elif t_method == "scale":
+            t_width, t_height = thumbnailer.aspect(t_width, t_height)
+            t_width = min(m_width, t_width)
+            t_height = min(m_height, t_height)
             t_len = thumbnailer.scale(t_path, t_width, t_height, t_type)
         else:
             t_len = None