from_backend() should always be called with len > 0. Only rlogin

[u/mdw/putty] / psftp.c

diff --git a/psftp.c b/psftp.c
index ead8614..094e68b 100644 (file)
--- a/psftp.c
+++ b/psftp.c
@@ -1512,6 +1512,8 @@ int from_backend(int is_stderr, char *data, int datalen)
     unsigned char *p = (unsigned char *) data;
     unsigned len = (unsigned) datalen;
 
+    assert(len > 0);
+
     /*
      * stderr data is just spouted to local stderr and otherwise
      * ignored.