ssh: ignore timeouts during disconnect

... as otherwise it risks not cleaning up the libssh2 handle properly
which leads to memory leak!

Assisted-by: Joel Depooter

Closes #1495
Closes #1479

Bug: https://curl.haxx.se/mail/lib-2017-04/0024.html

1 files changed, 15 insertions, 12 deletions

diff --git a/lib/ssh.c b/lib/ssh.c
index 863d7fd54..3670c750a 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -113,6 +113,7 @@
         libssh2_sftp_symlink_ex((s), (p), curlx_uztoui(strlen(p)), \
                                 (t), (m), LIBSSH2_SFTP_REALPATH)
 
+
 /* Local functions: */
 static const char *sftp_libssh2_strerror(int err);
 static LIBSSH2_ALLOC_FUNC(my_libssh2_malloc);
@@ -2815,7 +2816,7 @@ static CURLcode ssh_multi_statemach(struct connectdata *conn, bool *done)
 }
 
 static CURLcode ssh_block_statemach(struct connectdata *conn,
-                                   bool duringconnect)
+                                    bool disconnect)
 {
   struct ssh_conn *sshc = &conn->proto.sshc;
   CURLcode result = CURLE_OK;
@@ -2830,17 +2831,19 @@ static CURLcode ssh_block_statemach(struct connectdata *conn,
     if(result)
       break;
 
-    if(Curl_pgrsUpdate(conn))
-      return CURLE_ABORTED_BY_CALLBACK;
+    if(!disconnect) {
+      if(Curl_pgrsUpdate(conn))
+        return CURLE_ABORTED_BY_CALLBACK;
 
-    result = Curl_speedcheck(data, now);
-    if(result)
-      break;
+      result = Curl_speedcheck(data, now);
+      if(result)
+        break;
 
-    left = Curl_timeleft(data, NULL, duringconnect);
-    if(left < 0) {
-      failf(data, "Operation timed out");
-      return CURLE_OPERATION_TIMEDOUT;
+      left = Curl_timeleft(data, NULL, FALSE);
+      if(left < 0) {
+        failf(data, "Operation timed out");
+        return CURLE_OPERATION_TIMEDOUT;
+      }
     }
 
 #ifdef HAVE_LIBSSH2_SESSION_BLOCK_DIRECTION
@@ -3056,7 +3059,7 @@ static CURLcode scp_disconnect(struct connectdata *conn, bool dead_connection)
 
     state(conn, SSH_SESSION_DISCONNECT);
 
-    result = ssh_block_statemach(conn, FALSE);
+    result = ssh_block_statemach(conn, TRUE);
   }
 
   return result;
@@ -3210,7 +3213,7 @@ static CURLcode sftp_disconnect(struct connectdata *conn, bool dead_connection)
   if(conn->proto.sshc.ssh_session) {
     /* only if there's a session still around to use! */
     state(conn, SSH_SFTP_SHUTDOWN);
-    result = ssh_block_statemach(conn, FALSE);
+    result = ssh_block_statemach(conn, TRUE);
   }
 
   DEBUGF(infof(conn->data, "SSH DISCONNECT is done\n"));