From: Terry Wilson <twilson@digium.com>
Date: Wed, 16 Mar 2011 19:28:41 +0000 (+0000)
Subject: Don't keep trying to write to a closed connection
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=adefcd6cd161c2c234a6643b8c137331dcf544a0;p=thirdparty%2Fasterisk.git

Don't keep trying to write to a closed connection

See security advisory AST-2011-003.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@310994 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/main/manager.c b/main/manager.c
index 1604770f4f..70b2593c39 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -220,6 +220,7 @@ struct mansession {
 	struct mansession_session *session;
 	FILE *f;
 	int fd;
+	int write_error:1;
 };
 
 #define NEW_EVENT(m)	(AST_LIST_NEXT(m->session->last_ev, eq_next))
@@ -944,11 +945,15 @@ struct ast_variable *astman_get_variables(const struct message *m)
  */
 static int send_string(struct mansession *s, char *string)
 {
-	if (s->f) {
-		return ast_careful_fwrite(s->f, s->fd, string, strlen(string), s->session->writetimeout);
-	} else {
-		return ast_careful_fwrite(s->session->f, s->session->fd, string, strlen(string), s->session->writetimeout);
+	int res;
+
+	if (s->f && (res = ast_careful_fwrite(s->f, s->fd, string, strlen(string), s->session->writetimeout))) {
+		s->write_error = 1;
+	} else if ((res = ast_careful_fwrite(s->session->f, s->session->fd, string, strlen(string), s->session->writetimeout))) {
+		s->write_error = 1;
 	}
+
+	return res;
 }
 
 /*!
@@ -3207,7 +3212,7 @@ static void *session_do(void *data)
 
 	astman_append(&s, "Asterisk Call Manager/%s\r\n", AMI_VERSION);	/* welcome prompt */
 	for (;;) {
-		if ((res = do_message(&s)) < 0)
+		if ((res = do_message(&s)) < 0 || s.write_error)
 			break;
 	}
 	/* session is over, explain why and terminate */