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upstream: check the return value of ssh_packet_write_poll() and

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call sshpkt_fatal() if it fails; avoid potential busy-loop under some
circumstances. Based on patch by Mike Frysinger; ok dtucker@

OpenBSD-Commit-ID: c79fe5cf4f0cd8074cb6db257c1394d5139408ec
This commit is contained in:
djm@openbsd.org 2020-01-30 07:20:57 +00:00 committed by Damien Miller
parent dce74eab0c
commit 65d6fd0a8a
1 changed files with 7 additions and 3 deletions
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10
clientloop.c
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@ -1,4 +1,4 @@
/* $OpenBSD: clientloop.c,v 1.337 2020/01/29 08:17:49 djm Exp $ */
/* $OpenBSD: clientloop.c,v 1.338 2020/01/30 07:20:57 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1392,8 +1392,12 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
* Send as much buffered packet data as possible to the
* sender.
*/
if (FD_ISSET(connection_out, writeset))
ssh_packet_write_poll(ssh);
if (FD_ISSET(connection_out, writeset)) {
if ((r = ssh_packet_write_poll(ssh)) != 0) {
sshpkt_fatal(ssh, r,
"%s: ssh_packet_write_poll", __func__);
}
}
/*
* If we are a backgrounded control master, and the