[PATCH] ext4: test for illegal memory access caused by quota index information error

[Sun Ke <sunke32@huawei.com>]

The quota index information in the image is tampered, causing illegal
memory access.
It is a regression test for Kernel commit 9bf3d2033129 quota: check block
number when reading the block in quota file and commit d0e36a62bd4c
quota: correct error number in free_dqentry().

Signed-off-by: Sun Ke <sunke32@huawei.com>
---
 tests/ext4/054     | 36 ++++++++++++++++++++++++++++++++++++
 tests/ext4/054.out |  1 +
 2 files changed, 37 insertions(+)
 create mode 100755 tests/ext4/054
 create mode 100644 tests/ext4/054.out

diff --git a/tests/ext4/054 b/tests/ext4/054
new file mode 100755
index 00000000..286b5ecb
--- /dev/null
+++ b/tests/ext4/054
@@ -0,0 +1,36 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Huawei.  All Rights Reserved.
+#
+# FS QA Test 054
+#
+# Regression test for kernel
+# commit 9bf3d2033129 quota: check block number when reading the block in quota file
+# commit d0e36a62bd4c quota: correct error number in free_dqentry()
+#
+# The test is based on a testcase from Zhang Yi <yi.zhang@huawei.com>.
+#
+. ./common/preamble
+_begin_fstest auto
+
+# real QA test starts here
+
+# Modify as appropriate.
+_require_scratch
+_supported_fs ext4
+_require_user fsgqa
+_require_user fsgqa2
+
+_scratch_mkfs "-F -O quota -b 1024" > $seqres.full 2>&1
+debugfs -w -R "zap_block -o 0 -l 1 -p 6 -f <3> 1" $SCRATCH_DEV >> $seqres.full 2>&1
+_scratch_mount >> $seqres.full 2>&1
+chown fsgqa:fsgqa $SCRATCH_MNT >> $seqres.full 2>&1
+touch $SCRATCH_MNT/foo >> $seqres.full 2>&1
+rm -f $SCRATCH_MNT/foo
+chown fsgqa2:fsgqa2 $SCRATCH_MNT >> $seqres.full 2>&1
+
+umount $SCRATCH_MNT
+
+# success, all done
+status=0
+exit
diff --git a/tests/ext4/054.out b/tests/ext4/054.out
new file mode 100644
index 00000000..03e258bb
--- /dev/null
+++ b/tests/ext4/054.out
@@ -0,0 +1 @@
+QA output created by 054
-- 
2.13.6