37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
|
From: Kevin Wolf <kwolf@redhat.com>
|
||
|
To: qemu-devel@nongnu.org
|
||
|
Subject: [Qemu-devel] [PATCH] qcow2 corruption: Fix alloc_cluster_link_l2
|
||
|
|
||
|
This patch fixes a qcow2 corruption bug introduced in SVN Rev 5861. L2 tables
|
||
|
are big endian, so entries must be converted before being passed to functions.
|
||
|
|
||
|
This bug is easy to trigger. The following script will create and destroy a
|
||
|
qcow2 image (the header is gone after three loop iterations):
|
||
|
|
||
|
#!/bin/bash
|
||
|
qemu-img create -f qcow2 test.qcow 1M
|
||
|
for i in $(seq 1 10); do
|
||
|
qemu-system-x86_64 -hda test.qcow -monitor stdio > /dev/null 2>&1 <<EOF
|
||
|
savevm test-$i
|
||
|
quit
|
||
|
EOF
|
||
|
done
|
||
|
|
||
|
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
||
|
---
|
||
|
block-qcow2.c | 2 +-
|
||
|
1 files changed, 1 insertions(+), 1 deletions(-)
|
||
|
|
||
|
diff -up qemu-kvm-0.10/qemu/block-qcow2.c.qcow2-corruption qemu-kvm-0.10/qemu/block-qcow2.c
|
||
|
--- qemu-kvm-0.10/qemu/block-qcow2.c.qcow2-corruption 2009-04-20 14:41:22.000000000 +0100
|
||
|
+++ qemu-kvm-0.10/qemu/block-qcow2.c 2009-04-20 14:41:54.000000000 +0100
|
||
|
@@ -912,7 +912,7 @@ static int alloc_cluster_link_l2(BlockDr
|
||
|
goto err;
|
||
|
|
||
|
for (i = 0; i < j; i++)
|
||
|
- free_any_clusters(bs, old_cluster[i], 1);
|
||
|
+ free_any_clusters(bs, be64_to_cpu(old_cluster[i]), 1);
|
||
|
|
||
|
ret = 0;
|
||
|
err:
|