CVE-2021-47012 RDMA/siw: Fix a use after free in siw_alloc_mr

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix a use after free in siwallocmr Our code analyzer reported a UAF. In siwallocmr, it calls siwmraddmemmr,... In the implementation of siwmraddmem, mem is assigned to mr-mem and then mem is freed via kfreemem if...