RDMA/rxe: Make sure requested access is a subset of {mr,mw}->access

We should reject the requests with access flags that is not registered by
MR/MW. For example, lookup_mr() should return NULL when requested access
is 0x03 and mr->access is 0x01.

Link: https://lore.kernel.org/r/20220927055337.22630-2-lizhijian@fujitsu.comSigned-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_mr.c

@@ -511,7 +511,7 @@ struct rxe_mr *lookup_mr(struct rxe_pd *pd, int access, u32 key,
 
 	if (unlikely((type == RXE_LOOKUP_LOCAL && mr->lkey != key) ||
 		     (type == RXE_LOOKUP_REMOTE && mr->rkey != key) ||
-		     mr_pd(mr) != pd || (access && !(access & mr->access)) ||
+		     mr_pd(mr) != pd || ((access & mr->access) != access) ||
 		     mr->state != RXE_MR_STATE_VALID)) {
 		rxe_put(mr);
 		mr = NULL;

drivers/infiniband/sw/rxe/rxe_mw.c

@@ -293,8 +293,7 @@ struct rxe_mw *rxe_lookup_mw(struct rxe_qp *qp, int access, u32 rkey)
 
 	if (unlikely((mw->rkey != rkey) || rxe_mw_pd(mw) != pd ||
 		     (mw->ibmw.type == IB_MW_TYPE_2 && mw->qp != qp) ||
-		     (mw->length == 0) ||
-		     (access && !(access & mw->access)) ||
+		     (mw->length == 0) || ((access & mw->access) != access) ||
 		     mw->state != RXE_MW_STATE_VALID)) {
 		rxe_put(mw);
 		return NULL;