From: Kevin Wolf <kwolf@redhat.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>
Subject: [Qemu-devel] [PATCH] qcow2: Fix grow_refcount_table error handling
Date: Thu, 15 Oct 2009 17:31:01 +0200 [thread overview]
Message-ID: <1255620661-6810-1-git-send-email-kwolf@redhat.com> (raw)
In case of failure, we haven't increased the refcount for the newly allocated
cluster yet. Therefore we must not free the cluster or its refcount will become
negative (and endless recursion is possible).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/qcow2-refcount.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 609eee1..3026678 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -182,7 +182,6 @@ static int grow_refcount_table(BlockDriverState *bs, int min_size)
qcow2_free_clusters(bs, old_table_offset, old_table_size * sizeof(uint64_t));
return 0;
fail:
- qcow2_free_clusters(bs, table_offset, new_table_size2);
qemu_free(new_table);
return -EIO;
}
--
1.6.2.5
reply other threads:[~2009-10-15 15:32 UTC|newest]
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