From eeeebd02e7fddd36544c525e75e66b035c5dad82 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 7 Jun 2010 13:10:51 +0200
Subject: [PATCH] SFTP: fail init SFTP if session isn't authenticated

Alexander Lamaison filed bug #172
(http://trac.libssh2.org/ticket/172), and pointed out that SFTP
init would do bad if the session isn't yet authenticated at the
time of the call, so we now check for this situation and returns
an error if detected. Calling sftp_init() at this point is bad
usage to start with.
---
 src/sftp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/sftp.c b/src/sftp.c
index 95b5802..8d00225 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -716,6 +716,13 @@ static LIBSSH2_SFTP *sftp_init(LIBSSH2_SESSION *session)
 LIBSSH2_API LIBSSH2_SFTP *libssh2_sftp_init(LIBSSH2_SESSION *session)
 {
     LIBSSH2_SFTP *ptr;
+
+    if(!(session->state & LIBSSH2_STATE_AUTHENTICATED)) {
+        _libssh2_error(session, LIBSSH2_ERROR_INVAL,
+                       "session not authenticated yet");
+        return NULL;
+    }
+
     BLOCK_ADJUST_ERRNO(ptr, session, sftp_init(session));
     return ptr;
 }