linux-hardening - [PATCH] bnx2: Pass allocation size to build

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Message-Id: <20221018085911.never.761-kees@kernel.org>
Date:   Tue, 18 Oct 2022 01:59:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Rasesh Mody <rmody@...vell.com>
Cc:     Kees Cook <keescook@...omium.org>, GR-Linux-NIC-Dev@...vell.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] bnx2: Pass allocation size to build_skb()

In preparation for requiring that build_skb() have a non-zero size
argument, pass the actual data allocation size explicitly into
build_skb().

Cc: Rasesh Mody <rmody@...vell.com>
Cc: GR-Linux-NIC-Dev@...vell.com
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/ethernet/broadcom/bnx2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index fec57f1982c8..0b2d4972343a 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -3045,7 +3045,8 @@ bnx2_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u8 *data,
 
 	dma_unmap_single(&bp->pdev->dev, dma_addr, bp->rx_buf_use_size,
 			 DMA_FROM_DEVICE);
-	skb = build_skb(data, 0);
+
+	skb = build_skb(data, bp->rx_buf_size);
 	if (!skb) {
 		kfree(data);
 		goto error;
-- 
2.34.1