vmdk: Fix integer overflow in offset calculation

This fixes the bug introduced by commit c6ac36e (vmdk: Optimize cluster
allocation).

$ ~/build/master/qemu-io /stor/vm/arch.vmdk -c 'write 2G 1k'
write failed: Invalid argument

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1411437381-11234-1-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/vmdk.c

@@ -1113,7 +1113,7 @@ static int get_cluster_offset(BlockDriverState *bs,
     uint32_t min_count, *l2_table;
     bool zeroed = false;
     int64_t ret;
-    int32_t cluster_sector;
+    int64_t cluster_sector;
 
     if (m_data) {
         m_data->valid = 0;

tests/qemu-iotests/105

@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Create, read, write big image
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=famz@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2 vmdk vhdx qed
+_supported_proto generic
+_supported_os Linux
+_unsupported_imgopts "subformat=twoGbMaxExtentFlat" \
+                     "subformat=twoGbMaxExtentSparse"
+
+echo
+echo "creating large image"
+_make_test_img 16T
+
+echo
+echo "small read"
+$QEMU_IO -c "read 1024 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small write"
+$QEMU_IO -c "write 8192 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small read at high offset"
+$QEMU_IO -c "read 14T 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small write at high offset"
+$QEMU_IO -c "write 14T 4096" "$TEST_IMG" | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/105.out

@@ -0,0 +1,21 @@
+QA output created by 105
+
+creating large image
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=17592186044416
+
+small read
+read 4096/4096 bytes at offset 1024
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small write
+wrote 4096/4096 bytes at offset 8192
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small read at high offset
+read 4096/4096 bytes at offset 15393162788864
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small write at high offset
+wrote 4096/4096 bytes at offset 15393162788864
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done

tests/qemu-iotests/group

@@ -105,3 +105,4 @@
 101 rw auto quick
 103 rw auto quick
 104 rw auto
+105 rw auto quick