Commit 39ba3bf6 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi

qcow2: fix new_blocks double-free in alloc_refcount_block()

Commit de82815d ("qcow2: Handle failure
for potentially large allocations") introduced a double-free of
new_blocks in the alloc_refcount_block() error path.

The qemu-iotests qcow2 026 test case was failing because qemu-io

Make sure new_blocks is NULL after we free it the first time.
Reviewed-by: default avatarKevin Wolf <>
Signed-off-by: default avatarStefan Hajnoczi <>
parent 94c83a24
......@@ -381,6 +381,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
ret = bdrv_pwrite_sync(bs->file, meta_offset, new_blocks,
blocks_clusters * s->cluster_size);
new_blocks = NULL;
if (ret < 0) {
goto fail_table;
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