[Qemu-devel] [PATCH v2] vmdk: Fix integer overflow in offset calculation

[Fam Zheng <famz@redhat.com>]

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>
Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/vmdk.c               |  2 +-
 tests/qemu-iotests/005     | 10 +++++++++-
 tests/qemu-iotests/005.out | 10 +++++++++-
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/block/vmdk.c b/block/vmdk.c
index a1cb911..3fd7738 100644
--- a/block/vmdk.c
+++ b/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;
diff --git a/tests/qemu-iotests/005 b/tests/qemu-iotests/005
index ba1236d..fc8944c 100755
--- a/tests/qemu-iotests/005
+++ b/tests/qemu-iotests/005
@@ -59,7 +59,7 @@ fi
 
 echo
 echo "creating large image"
-_make_test_img 5000G
+_make_test_img 16T
 
 echo
 echo "small read"
@@ -69,6 +69,14 @@ echo
 echo "small write"
 $QEMU_IO -c "write 8192 4096" "$TEST_IMG" | _filter_qemu_io
 
+echo
+echo "small read at high offset"
+$QEMU_IO -c "read 4T 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small write at high offset"
+$QEMU_IO -c "write 4T 4096" "$TEST_IMG" | _filter_qemu_io
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/005.out b/tests/qemu-iotests/005.out
index 2d3e7df..fd6aed9 100644
--- a/tests/qemu-iotests/005.out
+++ b/tests/qemu-iotests/005.out
@@ -1,7 +1,7 @@
 QA output created by 005
 
 creating large image
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=5368709120000 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=17592186044416
 
 small read
 read 4096/4096 bytes at offset 1024
@@ -10,4 +10,12 @@ read 4096/4096 bytes at offset 1024
 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 4398046511104
+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 4398046511104
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 *** done
-- 
1.9.3