From 83edf3e43e86781872a07d8eb53084f59ad7384c Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Mon, 21 Sep 2009 02:42:35 +0200
Subject: [PATCH] s3:winbindd: avoid writing to a closed connection and
 generate SIGPIPE

metze
---
 source3/winbindd/winbindd.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/source3/winbindd/winbindd.c b/source3/winbindd/winbindd.c
index 9d4676f9b597..f0160fcb78fb 100644
--- a/source3/winbindd/winbindd.c
+++ b/source3/winbindd/winbindd.c
@@ -692,6 +692,8 @@ static void winbind_client_response_written(struct tevent_req *req)
 	ret = wb_resp_write_recv(req, &err);
 	TALLOC_FREE(req);
 	if (ret == -1) {
+		close(state->sock);
+		state->sock = -1;
 		DEBUG(2, ("Could not write response to client: %s\n",
 			  strerror(err)));
 		remove_client(state);
@@ -792,6 +794,8 @@ static void winbind_client_request_read(struct tevent_req *req)
 	ret = wb_req_read_recv(req, state, &state->request, &err);
 	TALLOC_FREE(req);
 	if (ret == -1) {
+		close(state->sock);
+		state->sock = -1;
 		DEBUG(2, ("Could not read client request: %s\n",
 			  strerror(err)));
 		remove_client(state);
@@ -813,22 +817,19 @@ static void remove_client(struct winbindd_cli_state *state)
 		return;
 	}
 
-	/* tell client, we are closing ... */
-	nwritten = write(state->sock, &c, sizeof(c));
-	if (nwritten == -1) {
-		/* 
-		 * ignore EPIPE error here, because the other end might
-		 * have already closed the socket.
-		 */
-		if (errno != EPIPE) {
+	if (state->sock != -1) {
+		/* tell client, we are closing ... */
+		nwritten = write(state->sock, &c, sizeof(c));
+		if (nwritten == -1) {
 			DEBUG(2, ("final write to client failed: %s\n",
-			  	strerror(errno)));
+				strerror(errno)));
 		}
-	}
 
-	/* Close socket */
+		/* Close socket */
 
-	close(state->sock);
+		close(state->sock);
+		state->sock = -1;
+	}
 
 	/* Free any getent state */
 
-- 
2.34.1