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-rw-r--r--synapse/rest/media/v1/base_resource.py2
-rw-r--r--synapse/rest/media/v1/upload_resource.py8
2 files changed, 8 insertions, 2 deletions
diff --git a/synapse/rest/media/v1/base_resource.py b/synapse/rest/media/v1/base_resource.py
index ad2c9d4e74..60751da1d1 100644
--- a/synapse/rest/media/v1/base_resource.py
+++ b/synapse/rest/media/v1/base_resource.py
@@ -155,7 +155,7 @@ class BaseMediaResource(Resource):
                 if upload_name:
                     upload_name = urlparse.unquote(upload_name)
                     try:
-                        upload_name = upload_name.decode("utf-8");
+                        upload_name = upload_name.decode("utf-8")
                     except UnicodeDecodeError:
                         upload_name = None
             else:
diff --git a/synapse/rest/media/v1/upload_resource.py b/synapse/rest/media/v1/upload_resource.py
index 21d8fb9ce9..031bfa80f8 100644
--- a/synapse/rest/media/v1/upload_resource.py
+++ b/synapse/rest/media/v1/upload_resource.py
@@ -86,7 +86,13 @@ class UploadResource(BaseMediaResource):
 
         upload_name = request.args.get("filename", None)
         if upload_name:
-            upload_name = upload_name[0].decode('UTF-8')
+            try:
+                upload_name = upload_name[0].decode('UTF-8')
+            except UnicodeDecodeError:
+                raise SynapseError(
+                    msg="Invalid UTF-8 filename parameter: %r" % (upload_name),
+                    code=400,
+                )
 
         headers = request.requestHeaders