RDMA/hns: Fix undifined behavior caused by invalid max_sge

If max_sge has been set to 0, roundup_pow_of_two() in
set_srq_basic_param() may have undefined behavior.

Fixes: 9dd0524 ("RDMA/hns: Allocate one more recv SGE for HIP08")
Signed-off-by: Chengchang Tang <[email protected]>
Signed-off-by: Junxian Huang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>

Author: Chengchang Tang

drivers/infiniband/hw/hns/hns_roce_srq.c

@@ -297,7 +297,7 @@ static int set_srq_basic_param(struct hns_roce_srq *srq,
 
 	max_sge = proc_srq_sge(hr_dev, srq, !!udata);
 	if (attr->max_wr > hr_dev->caps.max_srq_wrs ||
-	    attr->max_sge > max_sge) {
+	    attr->max_sge > max_sge || !attr->max_sge) {
 		ibdev_err(&hr_dev->ib_dev,
 			  "invalid SRQ attr, depth = %u, sge = %u.\n",
 			  attr->max_wr, attr->max_sge);