1 files changed, 2 insertions, 0 deletions

diff --git a/editors/awk.c b/editors/awk.c
index b9c8d2130..8e79d3159 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -1853,6 +1853,8 @@ static void handle_special(var *v)
 
         if (v == intvar[NF]) {
                 n = (int)getvar_i(v);
+                if (n < 0)
+                        syntax_error("NF set to negative value");
                 fsrealloc(n);
 
                 /* recalculate $0 */