linux-kernel - [PATCH 05/26] RDMA/erdma: use array

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Date:   Fri, 23 Jun 2023 23:14:36 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Cheng Xu <chengyou@...ux.alibaba.com>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        Kai Shen <kaishen@...ux.alibaba.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/26] RDMA/erdma: use array_size

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/infiniband/hw/erdma/erdma_verbs.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 83e1b0d55977..c49160f6ff27 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -462,8 +462,8 @@ static int init_kernel_qp(struct erdma_dev *dev, struct erdma_qp *qp,
 		dev->func_bar + (ERDMA_SDB_SHARED_PAGE_INDEX << PAGE_SHIFT);
 	kqp->hw_rq_db = dev->func_bar + ERDMA_BAR_RQDB_SPACE_OFFSET;
 
-	kqp->swr_tbl = vmalloc(qp->attrs.sq_size * sizeof(u64));
-	kqp->rwr_tbl = vmalloc(qp->attrs.rq_size * sizeof(u64));
+	kqp->swr_tbl = vmalloc(array_size(qp->attrs.sq_size, sizeof(u64)));
+	kqp->rwr_tbl = vmalloc(array_size(qp->attrs.rq_size, sizeof(u64)));
 	if (!kqp->swr_tbl || !kqp->rwr_tbl)
 		goto err_out;