setlayout: NUL terminate ltsymbolHEADmaster

1 files changed, 2 insertions, 1 deletions

diff --git a/dwm.c b/dwm.c
index 421704c..35cce9a 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1520,7 +1520,8 @@ setlayout(const Arg *arg)
 		selmon->sellt ^= 1;
 	if (arg && arg->v)
 		selmon->lt[selmon->sellt] = (Layout *)arg->v;
-	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
+	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof(selmon->ltsymbol) - 1);
+	selmon->ltsymbol[sizeof(selmon->ltsymbol) - 1] = '\0';
 	if (selmon->sel)
 		arrange(selmon);
 	else