krb5: use private buffer for temp string, not receive buffer

diff --git a/lib/krb5.c b/lib/krb5.c
index 067b0a5778249ad4dfe2a3607d1be1c5eec52cf3..69a35979a89fd6d1470d894fff7a5e05706c4fcb 100644 (file)
--- a/lib/krb5.c
+++ b/lib/krb5.c
@@ -164,6 +164,7 @@ krb5_auth(void *app_data, struct connectdata *conn)
   size_t base64_sz = 0;
   struct sockaddr_in **remote_addr =
     (struct sockaddr_in **)&conn->ip_addr->ai_addr;
+  char *stringp;
 
   if(getsockname(conn->sock[FIRSTSOCKET],
                  (struct sockaddr *)&conn->local_addr, &l) < 0)
@@ -193,16 +194,19 @@ krb5_auth(void *app_data, struct connectdata *conn)
         return -1;
     }
 
-    input_buffer.value = data->state.buffer;
-    input_buffer.length = snprintf(input_buffer.value, BUFSIZE, "%s@%s",
-                                   service, host);
+    stringp = aprintf("%s@%s", service, host);
+    if(!stringp)
+      return -2;
+
+    input_buffer.value = stringp;
+    input_buffer.length = strlen(stringp);
     maj = gss_import_name(&min, &input_buffer, GSS_C_NT_HOSTBASED_SERVICE,
                           &gssname);
+    free(stringp);
     if(maj != GSS_S_COMPLETE) {
       gss_release_name(&min, &gssname);
       if(service == srv_host) {
-        Curl_failf(data, "Error importing service name %s",
-                   input_buffer.value);
+        Curl_failf(data, "Error importing service name %s@%s", service, host);
         return AUTH_ERROR;
       }
       service = srv_host;