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-rw-r--r--bin/ksh/expr.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/bin/ksh/expr.c b/bin/ksh/expr.c
index 5d85b521fe4..71e54091b44 100644
--- a/bin/ksh/expr.c
+++ b/bin/ksh/expr.c
@@ -1,4 +1,4 @@
-/* $NetBSD: expr.c,v 1.12 2018/05/08 16:37:59 kamil Exp $ */
+/* $NetBSD: expr.c,v 1.13 2022/07/03 06:30:31 kre Exp $ */
/*
* Korn expression evaluation
@@ -9,7 +9,7 @@
#include <sys/cdefs.h>
#ifndef lint
-__RCSID("$NetBSD: expr.c,v 1.12 2018/05/08 16:37:59 kamil Exp $");
+__RCSID("$NetBSD: expr.c,v 1.13 2022/07/03 06:30:31 kre Exp $");
#endif
@@ -311,6 +311,8 @@ evalexpr(es, prec)
token(es);
} else if (op == O_PLUSPLUS || op == O_MINUSMINUS) {
token(es);
+ if (es->tok != VAR)
+ evalerr(es, ET_LVALUE, opinfo[(int) op].name);
vl = do_ppmm(es, op, es->val, true);
token(es);
} else if (op == VAR || op == LIT) {