diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e5125677efa007a8ff58d5cd14b70766117dbc92..1bbfa0446507405d2fce92036322224170d7411e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2899,6 +2899,8 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
 	if (copy_from_user(&buf, ubuf, cnt))
 		return -EFAULT;
 
+	buf[cnt] = 0;
+
 	trace_set_options(buf);
 
 	*ppos += cnt;