Avoid write to invalid file descriptor in nscd

When readding entries to the group and services cache and the lookup
is unsuccesful, we tried to write the notfound record.  Just don't
do it in this case.

1 files changed, 3 insertions, 2 deletions

diff --git a/nscd/grpcache.c b/nscd/grpcache.c
index fa21929014..0e7f81f535 100644
--- a/nscd/grpcache.c
+++ b/nscd/grpcache.c
@@ -114,8 +114,9 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
 	     case.  */
 	  total = sizeof (notfound);
 
-	  written = TEMP_FAILURE_RETRY (send (fd, &notfound, total,
-					      MSG_NOSIGNAL));
+	  if (fd != -1)
+	    written = TEMP_FAILURE_RETRY (send (fd, &notfound, total,
+						MSG_NOSIGNAL));
 
 	  dataset = mempool_alloc (db, sizeof (struct dataset) + req->key_len,
 				   1);