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qcow2: fix new_blocks double-free in alloc_refcount_block()

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Commit de82815db1 ("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
segfaulted.

Make sure new_blocks is NULL after we free it the first time.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-08-15 17:59:54 +01:00
parent 94c83a24c1
commit 39ba3bf69c
1 changed files with 1 additions and 0 deletions
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block/qcow2-refcount.c
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@ -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);
g_free(new_blocks);
new_blocks = NULL;
if (ret < 0) {
goto fail_table;
}