From 40a79d355864bd0431fc33719e00675f6a25b323 Mon Sep 17 00:00:00 2001
From: Will Cosgrove <will@panic.com>
Date: Thu, 15 Mar 2018 16:53:58 -0700
Subject: [PATCH] Fixes incorrect indexing of KEX prefs string

After stripping out an invalid KEX pref entry, it would incorrectly advance again leaving invalid values in the list.
---
 src/kex.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/kex.c b/src/kex.c
index 6a34a712..4e47f2d0 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -3527,8 +3527,9 @@ libssh2_session_method_pref(LIBSSH2_SESSION * session, int method_type,
                 }
             }
         }
-
-        s = p ? (p + 1) : NULL;
+        else {
+            s = p ? (p + 1) : NULL;
+        }
     }
 
     if(strlen(newprefs) == 0) {