commit 83b4a5db240960720e51b7d5a6da1f399bd868ee
author Damien Neil <dneil@google.com> Wed Jul 23 14:26:54 2025 -0700
committer Gopher Robot <gobot@golang.org> Wed Aug 06 10:49:43 2025 -0700
tree 43c3e44c544aa58ac08c20f06c848a5321e81ff3
parent 0f5133b742bf61cda6c98b4cd1d313a330f13f32

[release-branch.go1.24] database/sql: avoid closing Rows while scan is in progress

A database/sql/driver.Rows can return database-owned data
from Rows.Next. The driver.Rows documentation doesn't explicitly
document the lifetime guarantees for this data, but a reasonable
expectation is that the caller of Next should only access it
until the next call to Rows.Close or Rows.Next.

Avoid violating that constraint when a query is cancelled while
a call to database/sql.Rows.Scan (note the difference between
the two different Rows types!) is in progress. We previously
took care to avoid closing a driver.Rows while the user has
access to driver-owned memory via a RawData, but we could still
close a driver.Rows while a Scan call was in the process of
reading previously-returned driver-owned data.

Update the fake DB used in database/sql tests to invalidate
returned data to help catch other places we might be
incorrectly retaining it.

Updates #74831
Fixes #74833

Change-Id: Ice45b5fad51b679c38e3e1d21ef39156b56d6037
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2540
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Neal Patel <nealpatel@google.com>
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2620
Reviewed-on: https://go-review.googlesource.com/c/go/+/693616
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Mark Freeman <markfreeman@google.com>