RDMA/mana_ib: check cqe length for kernel CQs

Check queue size during kernel CQ creation to prevent overflow of u32.

Fixes: bec127e ("RDMA/mana_ib: create kernel-level CQs")
Link: https://patch.msgid.link/r/1761213780-5457-1-git-send-email-kotaranov@linux.microsoft.com
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: Konstantin Taranov

drivers/infiniband/hw/mana/cq.c

@@ -56,6 +56,10 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 		doorbell = mana_ucontext->doorbell;
 	} else {
 		is_rnic_cq = true;
+		if (attr->cqe > U32_MAX / COMP_ENTRY_SIZE / 2 + 1) {
+			ibdev_dbg(ibdev, "CQE %d exceeding limit\n", attr->cqe);
+			return -EINVAL;
+		}
 		buf_size = MANA_PAGE_ALIGN(roundup_pow_of_two(attr->cqe * COMP_ENTRY_SIZE));
 		cq->cqe = buf_size / COMP_ENTRY_SIZE;
 		err = mana_ib_create_kernel_queue(mdev, buf_size, GDMA_CQ, &cq->queue);