[PATCH v2 2/3] f2fs/019: do sanity check on mapping table

[Chao Yu <chao@kernel.org>]

This is a regression test:
1. create a file
2. write file to create a direct node at special offset
3. use inject.f2fs to inject nid of direct node w/ ino of the inode
4. check whether f2fs kernel module will detect and report such
   corruption in the fil

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
v2:
- use _require_scratch_nocheck instead of _require_scratch
- use $XFS_IO_PROG instead of xfs_io
- add comments for why exporting MKFS_OPTIONS=""
 tests/f2fs/019     | 42 ++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/019.out |  2 ++
 2 files changed, 44 insertions(+)
 create mode 100755 tests/f2fs/019
 create mode 100644 tests/f2fs/019.out

diff --git a/tests/f2fs/019 b/tests/f2fs/019
new file mode 100755
index 00000000..2307bd96
--- /dev/null
+++ b/tests/f2fs/019
@@ -0,0 +1,42 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 Chao Yu.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/019
+#
+# This is a regression test:
+# 1. create a file
+# 2. write file to create a direct node at special offset
+# 3. use inject.f2fs to inject nid of direct node w/ ino of the inode
+# 4. check whether f2fs kernel module will detect and report such
+#    corruption in the file
+#
+. ./common/preamble
+_begin_fstest auto quick rw
+
+_fixed_by_kernel_commit 77de19b6867f \
+	"f2fs: fix to avoid out-of-boundary access in dnode page"
+
+_require_scratch_nocheck
+_require_command "$F2FS_INJECT_PROG" inject.f2fs
+
+# remove all mkfs options to avoid layout change of on-disk inode
+export MKFS_OPTIONS=""
+
+testfile=$SCRATCH_MNT/testfile
+
+_scratch_mkfs >> $seqres.full
+_scratch_mount
+
+$XFS_IO_PROG -f -c "pwrite 3738M 1M" -c "fsync" $testfile >> $seqres.full
+
+_scratch_unmount
+
+$F2FS_INJECT_PROG --node --mb addr --nid 5 --idx 937 --val 4 $SCRATCH_DEV >> $seqres.full
+
+_scratch_mount
+$XFS_IO_PROG -c "pread 3700M 40M" $testfile
+_scratch_unmount
+
+status=0
+exit
diff --git a/tests/f2fs/019.out b/tests/f2fs/019.out
new file mode 100644
index 00000000..2f7469e2
--- /dev/null
+++ b/tests/f2fs/019.out
@@ -0,0 +1,2 @@
+QA output created by 019
+pread: Structure needs cleaning
-- 
2.49.0