linux-kernel - [PATCH rdma-next] RDMA/mana_ib: check cqe length for kernel CQs

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Message-Id: <1761213780-5457-1-git-send-email-kotaranov@linux.microsoft.com>
Date: Thu, 23 Oct 2025 03:03:00 -0700
From: Konstantin Taranov <kotaranov@...ux.microsoft.com>
To: kotaranov@...rosoft.com,
	shirazsaleem@...rosoft.com,
	longli@...rosoft.com,
	jgg@...pe.ca,
	leon@...nel.org
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH rdma-next] RDMA/mana_ib: check cqe length for kernel CQs

From: Konstantin Taranov <kotaranov@...rosoft.com>

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

Fixes: bec127e45d9f ("RDMA/mana_ib: create kernel-level CQs")
Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
---
 drivers/infiniband/hw/mana/cq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/mana/cq.c b/drivers/infiniband/hw/mana/cq.c
index 1becc8779..7600412b0 100644
--- a/drivers/infiniband/hw/mana/cq.c
+++ b/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);
-- 
2.43.0