From dee0375ffd4412e1883a406de0e3b315cdc7ff13 Mon Sep 17 00:00:00 2001
From: tidwall <joshbaker77@gmail.com>
Date: Sun, 28 Mar 2021 18:30:25 -0700
Subject: [PATCH] Fix negative without int part for valid

fixes #210
---
 gjson.go      | 6 ++++++
 gjson_test.go | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/gjson.go b/gjson.go
index 148c88e..7bb82e9 100644
--- a/gjson.go
+++ b/gjson.go
@@ -2382,6 +2382,12 @@ func validnumber(data []byte, i int) (outi int, ok bool) {
 	// sign
 	if data[i] == '-' {
 		i++
+		if i == len(data) {
+			return i, false
+		}
+		if data[i] < '0' || data[i] > '9' {
+			return i, false
+		}
 	}
 	// int
 	if i == len(data) {
diff --git a/gjson_test.go b/gjson_test.go
index 6f4dd7a..a1b939f 100644
--- a/gjson_test.go
+++ b/gjson_test.go
@@ -1030,6 +1030,7 @@ func TestValidBasic(t *testing.T) {
 	testvalid(t, "00", false)
 	testvalid(t, "-00", false)
 	testvalid(t, "-.", false)
+	testvalid(t, "-.123", false)
 	testvalid(t, "0.0", true)
 	testvalid(t, "10.0", true)
 	testvalid(t, "10e1", true)
@@ -1094,6 +1095,8 @@ func TestValidBasic(t *testing.T) {
 	testvalid(t, `"a\\b\\\uFFA"`, false)
 	testvalid(t, string(complicatedJSON), true)
 	testvalid(t, string(exampleJSON), true)
+	testvalid(t, "[-]", false)
+	testvalid(t, "[-.123]", false)
 }
 
 var jsonchars = []string{"{", "[", ",", ":", "}", "]", "1", "0", "true",