1 files changed, 5 insertions, 3 deletions

diff --git a/compat.c b/compat.c
index 00f031b8b..967e0b6b8 100644
--- a/compat.c
+++ b/compat.c
@@ -28,7 +28,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: compat.c,v 1.10 2000/05/09 01:03:00 damien Exp $");
+RCSID("$Id: compat.c,v 1.11 2000/05/30 03:44:53 damien Exp $");
 
 #include "ssh.h"
 #include "packet.h"
@@ -80,10 +80,12 @@ compat_datafellows(const char *version)
 int
 proto_spec(const char *spec)
 {
-        char *s = xstrdup(spec);
-        char *p;
+        char *s, *p;
         int ret = SSH_PROTO_UNKNOWN;
 
+        if (spec == NULL)
+                return ret;
+        s = xstrdup(spec);
         for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) {
                 switch(atoi(p)) {
                 case 1: