1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index 5591ad46a9..a69baac7bb 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -1942,6 +1942,7 @@ unix_send_io(VALUE sock, VALUE val)
     msg.msg_control = (caddr_t)&cmsg;
     msg.msg_controllen = CMSG_LEN(sizeof(int));
     msg.msg_flags = 0;
+    MEMZERO((char*)&cmsg, char, sizeof(cmsg));
     cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int));
     cmsg.hdr.cmsg_level = SOL_SOCKET;
     cmsg.hdr.cmsg_type = SCM_RIGHTS;