tree 31daaf4d5aa0dd928d6da2cea12856fe7e08b511
parent 33304ec9fa484e765c6249673e09e1b7d49c5b85
author Hu Tao <hutao@cn.fujitsu.com> 1390705959 +0800
committer Kevin Wolf <kwolf@redhat.com> 1391933559 +0100

qcow2: check for NULL l2meta

In the case of a metadata preallocation with a large cluster size,
qcow2_alloc_cluster_offset() can allocate nothing and returns a
NULL l2meta. This patch checks for it and link2 l2 with only valid
l2meta.

Replace 9 and 512 with BDRV_SECTOR_BITS, BDRV_SECTOR_SIZE
respectively while at the function.

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>