linux-kernel - [RFC PATCH v1 08/10] net: qrtr: Drop remote {NEW|DEL}

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Message-ID: <20241018181842.1368394-9-denkenz@gmail.com>
Date: Fri, 18 Oct 2024 13:18:26 -0500
From: Denis Kenzior <denkenz@...il.com>
To: netdev@...r.kernel.org
Cc: denkenz@...il.com,
	Marcel Holtmann <marcel@...tmann.org>,
	Andy Gross <agross@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 08/10] net: qrtr: Drop remote {NEW|DEL}_LOOKUP messages

These messages are explicitly filtered out by the in-kernel name
service (ns.c).  Filter them out even earlier to save some CPU cycles.

Signed-off-by: Denis Kenzior <denkenz@...il.com>
Reviewed-by: Marcel Holtmann <marcel@...tmann.org>
Reviewed-by: Andy Gross <agross@...nel.org>
---
 net/qrtr/af_qrtr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
index b2f9c25ba8f8..95c9679725ee 100644
--- a/net/qrtr/af_qrtr.c
+++ b/net/qrtr/af_qrtr.c
@@ -560,6 +560,11 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
 	if (!size || len != ALIGN(size, 4) + hdrlen)
 		goto err;
 
+	/* Don't allow remote lookups */
+	if (cb->type == QRTR_TYPE_NEW_LOOKUP ||
+	    cb->type == QRTR_TYPE_DEL_LOOKUP)
+		goto err;
+
 	if ((cb->type == QRTR_TYPE_NEW_SERVER ||
 	     cb->type == QRTR_TYPE_RESUME_TX) &&
 	    size < sizeof(struct qrtr_ctrl_pkt))
-- 
2.45.2