upstream: Revert previous commit. The channels code still uses int

in many places for channel ids so the INT_MAX check still makes sense.

OpenBSD-Commit-ID: 532e4b644791b826956c3c61d6ac6da39bac84bf

1 files changed, 7 insertions, 5 deletions

diff --git a/serverloop.c b/serverloop.c
index 16a4fd3e5..99d259201 100644
--- a/serverloop.c
+++ b/serverloop.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: serverloop.c,v 1.217 2019/11/27 03:34:04 dtucker Exp $ */
+/* $OpenBSD: serverloop.c,v 1.218 2019/11/27 05:38:43 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -675,7 +675,7 @@ server_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
         char *ctype = NULL;
         const char *errmsg = NULL;
         int r, reason = SSH2_OPEN_CONNECT_FAILED;
-        u_int32_t rchan = 0, rmaxpack = 0, rwindow = 0;
+        u_int rchan = 0, rmaxpack = 0, rwindow = 0;
 
         if ((r = sshpkt_get_cstring(ssh, &ctype, NULL)) != 0 ||
             (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
@@ -683,9 +683,11 @@ server_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
             (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
                 sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
         debug("%s: ctype %s rchan %u win %u max %u", __func__,
-            ctype, (u_int)rchan, (u_int)rwindow, (u_int)rmaxpack);
+            ctype, rchan, rwindow, rmaxpack);
 
-        if (strcmp(ctype, "session") == 0) {
+        if (rchan > INT_MAX) {
+                error("%s: invalid remote channel ID", __func__);
+        } else if (strcmp(ctype, "session") == 0) {
                 c = server_request_session(ssh);
         } else if (strcmp(ctype, "direct-tcpip") == 0) {
                 c = server_request_direct_tcpip(ssh, &reason, &errmsg);
@@ -696,7 +698,7 @@ server_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
         }
         if (c != NULL) {
                 debug("%s: confirm %s", __func__, ctype);
-                c->remote_id = rchan;
+                c->remote_id = (int)rchan;
                 c->have_remote_id = 1;
                 c->remote_window = rwindow;
                 c->remote_maxpacket = rmaxpack;