qcow2: Add plausibility check for L1/L2 entries (Kevin Wolf)
From: Kevin Wolf <kwolf@redhat.com> All L1 and L2 entries must point at the start of a cluster. If there is some offset into the cluster, the entry is corrupted. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7217 c046a42c-6fe2-441c-8c8c-71466251a162
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