GH-86508: skip binding to local addresses of different family in `asyncio.open_connection` (#100615)

1 files changed, 8 insertions, 2 deletions

diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index f2f9375..cbabb43 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -961,7 +961,10 @@ class BaseEventLoop(events.AbstractEventLoop):
             sock = socket.socket(family=family, type=type_, proto=proto)
             sock.setblocking(False)
             if local_addr_infos is not None:
-                for _, _, _, _, laddr in local_addr_infos:
+                for lfamily, _, _, _, laddr in local_addr_infos:
+                    # skip local addresses of different family
+                    if lfamily != family:
+                        continue
                     try:
                         sock.bind(laddr)
                         break
@@ -974,7 +977,10 @@ class BaseEventLoop(events.AbstractEventLoop):
                         exc = OSError(exc.errno, msg)
                         my_exceptions.append(exc)
                 else:  # all bind attempts failed
-                    raise my_exceptions.pop()
+                    if my_exceptions:
+                        raise my_exceptions.pop()
+                    else:
+                        raise OSError(f"no matching local address with {family=} found")
             await self.sock_connect(sock, address)
             return sock
         except OSError as exc: