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-rw-r--r--tests/server/tftpd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/server/tftpd.c b/tests/server/tftpd.c
index 6014842b5..f3e521b75 100644
--- a/tests/server/tftpd.c
+++ b/tests/server/tftpd.c
@@ -623,7 +623,7 @@ again:
/* store input protocol */
fprintf(server, "filename: %s\n", filename);
- for (cp = mode; *cp; cp++)
+ for (cp = mode; cp && *cp; cp++)
if(ISUPPER(*cp))
*cp = (char)tolower((int)*cp);