core: tokbuf: Fix buffer overflow

Signed-off-by: Chloe M. <chloe@mirocom.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/core/tokbuf.c b/core/tokbuf.c
index e880c15..05e8755 100644
--- a/core/tokbuf.c
+++ b/core/tokbuf.c
@@ -30,7 +30,7 @@ tokbuf_push(struct tokbuf *tokbuf, struct token *tok)
         return -1;
     }
 
-    if ((tokbuf->head++) >= TOKBUF_CAP) {
+    if ((tokbuf->head++) >= TOKBUF_CAP - 1) {
         tokbuf->head = 0;
     }