Always wrap arguments in parentheses in the SQL sanitizer

Author: jackc

internal/sanitize/sanitize.go

@@ -44,18 +44,8 @@ func (q *Query) Sanitize(args ...interface{}) (string, error) {
 				str = "null"
 			case int64:
 				str = strconv.FormatInt(arg, 10)
-				// Prevent SQL injection via Line Comment Creation
-				// https://github.com/jackc/pgx/security/advisories/GHSA-m7wr-2xf7-cm9p
-				if arg < 0 {
-					str = "(" + str + ")"
-				}
 			case float64:
-				// Prevent SQL injection via Line Comment Creation
-				// https://github.com/jackc/pgx/security/advisories/GHSA-m7wr-2xf7-cm9p
 				str = strconv.FormatFloat(arg, 'f', -1, 64)
-				if arg < 0 {
-					str = "(" + str + ")"
-				}
 			case bool:
 				str = strconv.FormatBool(arg)
 			case []byte:
@@ -68,6 +58,10 @@ func (q *Query) Sanitize(args ...interface{}) (string, error) {
 				return "", fmt.Errorf("invalid arg type: %T", arg)
 			}
 			argUse[argIdx] = true
+
+			// Prevent SQL injection via Line Comment Creation
+			// https://github.com/jackc/pgx/security/advisories/GHSA-m7wr-2xf7-cm9p
+			str = "(" + str + ")"
 		default:
 			return "", fmt.Errorf("invalid Part type: %T", part)
 		}

internal/sanitize/sanitize_test.go

@@ -127,52 +127,52 @@ func TestQuerySanitize(t *testing.T) {
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select 42"}},
 			args:     []interface{}{},
-			expected: `select 42`,
+			expected: `select (42)`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{int64(42)},
-			expected: `select 42`,
+			expected: `select (42)`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{float64(1.23)},
-			expected: `select 1.23`,
+			expected: `select (1.23)`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{true},
-			expected: `select true`,
+			expected: `select (true)`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{[]byte{0, 1, 2, 3, 255}},
-			expected: `select '\x00010203ff'`,
+			expected: `select ('\x00010203ff')`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{nil},
-			expected: `select null`,
+			expected: `select (null)`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{"foobar"},
-			expected: `select 'foobar'`,
+			expected: `select ('foobar')`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{"foo'bar"},
-			expected: `select 'foo''bar'`,
+			expected: `select ('foo''bar')`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select ", 1}},
 			args:     []interface{}{`foo\'bar`},
-			expected: `select 'foo\''bar'`,
+			expected: `select ('foo\''bar')`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"insert ", 1}},
 			args:     []interface{}{time.Date(2020, time.March, 1, 23, 59, 59, 999999999, time.UTC)},
-			expected: `insert '2020-03-01 23:59:59.999999Z'`,
+			expected: `insert ('2020-03-01 23:59:59.999999Z')`,
 		},
 		{
 			query:    sanitize.Query{Parts: []sanitize.Part{"select 1-", 1}},