RDMA: Check umem pointer validity prior to release

Update ib_umem_release() to behave similarly to kfree() and allow
submitting NULL pointer as safe input to this function.

Fixes: a52c8e2469c3 ("RDMA: Clean destroy CQ in drivers do not return errors")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c
index 54f3f9c27552..db800eb2b1f5 100644
--- a/drivers/infiniband/sw/rdmavt/mr.c
+++ b/drivers/infiniband/sw/rdmavt/mr.c
@@ -560,8 +560,7 @@ int rvt_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
         if (ret)
                 goto out;
         rvt_deinit_mregion(&mr->mr);
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
         kfree(mr);
 out:
         return ret;