linux-kernel - [PATCH] IB/mlx4: Avoid field-overflowing memcpy()

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Message-Id: <20210616203744.1248551-1-keescook@chromium.org>
Date:   Wed, 16 Jun 2021 13:37:44 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Kees Cook <keescook@...omium.org>,
        Yishai Hadas <yishaih@...dia.com>,
        Doug Ledford <dledford@...hat.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] IB/mlx4: Avoid field-overflowing memcpy()

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring array fields.

Use the ether_addr_copy() helper instead, as already done for smac.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/infiniband/hw/mlx4/qp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 2ae22bf50016..4a2ef7daaded 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -3144,7 +3144,7 @@ static int build_mlx_header(struct mlx4_ib_qp *qp, const struct ib_ud_wr *wr,
 		mlx->sched_prio = cpu_to_be16(pcp);
 
 		ether_addr_copy(sqp->ud_header.eth.smac_h, ah->av.eth.s_mac);
-		memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6);
+		ether_addr_copy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac);
 		memcpy(&ctrl->srcrb_flags16[0], ah->av.eth.mac, 2);
 		memcpy(&ctrl->imm, ah->av.eth.mac + 2, 4);
 
-- 
2.25.1