CVE-2021-47003

In the Linux kernel, the following vulnerability has been resolved:
dmaengine: idxd: Fix potential null dereference on pointer status There are
calls to idxd_cmd_exec that pass a null status pointer however a recent
commit has added an assignment to *status that can end up with a null
pointer dereference. The function expects a null status pointer sometimes
as there is a later assignment to *status where status is first null
checked. Fix the issue by null checking status before making the
assignment. Addresses-Coverity: (“Explicit null dereferenced”)