X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/41d3adbbfed77605e4a397ce199c5751c35bf94b..2b0c045b635e108602a614beb8bf8343c4d21102:/terminal.c

diff --git a/terminal.c b/terminal.c
index 1c817dac..d76d7349 100644
--- a/terminal.c
+++ b/terminal.c
@@ -3603,6 +3603,8 @@ int term_ldisc(int option)
  */
 int from_backend(int is_stderr, char *data, int len)
 {
+    assert(len > 0);
+
     bufchain_add(&inbuf, data, len);
 
     /*