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-rw-r--r--synapse/rest/client/v1/room.py20
1 files changed, 17 insertions, 3 deletions
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 5647e8c577..f95627ee61 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -46,7 +46,7 @@ from synapse.storage.state import StateFilter
 from synapse.streams.config import PaginationConfig
 from synapse.types import RoomAlias, RoomID, StreamToken, ThirdPartyInstanceID, UserID
 from synapse.util import json_decoder
-from synapse.util.stringutils import random_string
+from synapse.util.stringutils import parse_and_validate_server_name, random_string
 
 if TYPE_CHECKING:
     import synapse.server
@@ -347,8 +347,6 @@ class PublicRoomListRestServlet(TransactionRestServlet):
             # provided.
             if server:
                 raise e
-            else:
-                pass
 
         limit = parse_integer(request, "limit", 0)
         since_token = parse_string(request, "since", None)
@@ -359,6 +357,14 @@ class PublicRoomListRestServlet(TransactionRestServlet):
 
         handler = self.hs.get_room_list_handler()
         if server and server != self.hs.config.server_name:
+            # Ensure the server is valid.
+            try:
+                parse_and_validate_server_name(server)
+            except ValueError:
+                raise SynapseError(
+                    400, "Invalid server name: %s" % (server,), Codes.INVALID_PARAM,
+                )
+
             try:
                 data = await handler.get_remote_public_room_list(
                     server, limit=limit, since_token=since_token
@@ -402,6 +408,14 @@ class PublicRoomListRestServlet(TransactionRestServlet):
 
         handler = self.hs.get_room_list_handler()
         if server and server != self.hs.config.server_name:
+            # Ensure the server is valid.
+            try:
+                parse_and_validate_server_name(server)
+            except ValueError:
+                raise SynapseError(
+                    400, "Invalid server name: %s" % (server,), Codes.INVALID_PARAM,
+                )
+
             try:
                 data = await handler.get_remote_public_room_list(
                     server,