database/sql: buffers provided to Rows.Next should not be modified by drivers
Previously we allowed drivers to modify the row buffer used to scan
values when closing Rows. This is no longer acceptable and can lead
to data races.
Fixes #23519
Change-Id: I91820a6266ffe52f95f40bb47307d375727715af
Reviewed-on: https://go-review.googlesource.com/89936
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/src/database/sql/sql_test.go b/src/database/sql/sql_test.go
index 8137eff..ae6bf71 100644
--- a/src/database/sql/sql_test.go
+++ b/src/database/sql/sql_test.go
@@ -663,43 +663,6 @@
}
}
-func TestByteOwnership(t *testing.T) {
- db := newTestDB(t, "people")
- defer closeDB(t, db)
- rows, err := db.Query("SELECT|people|name,photo|")
- if err != nil {
- t.Fatalf("Query: %v", err)
- }
- type row struct {
- name []byte
- photo RawBytes
- }
- got := []row{}
- for rows.Next() {
- var r row
- err = rows.Scan(&r.name, &r.photo)
- if err != nil {
- t.Fatalf("Scan: %v", err)
- }
- got = append(got, r)
- }
- corruptMemory := []byte("\xffPHOTO")
- want := []row{
- {name: []byte("Alice"), photo: corruptMemory},
- {name: []byte("Bob"), photo: corruptMemory},
- {name: []byte("Chris"), photo: corruptMemory},
- }
- if !reflect.DeepEqual(got, want) {
- t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
- }
-
- var photo RawBytes
- err = db.QueryRow("SELECT|people|photo|name=?", "Alice").Scan(&photo)
- if err == nil {
- t.Error("want error scanning into RawBytes from QueryRow")
- }
-}
-
func TestRowsColumns(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
@@ -3192,8 +3155,11 @@
// reported.
rows, _ := tx.QueryContext(ctx, "WAIT|"+qwait+"|SELECT|people|name|")
if rows != nil {
+ var name string
// Call Next to test Issue 21117 and check for races.
for rows.Next() {
+ // Scan the buffer so it is read and checked for races.
+ rows.Scan(&name)
}
rows.Close()
}
