linux-kernel - [RFC PATCH v1 01/10] net: qrtr: ns: validate msglen before ctrl

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Message-ID: <20241018181842.1368394-2-denkenz@gmail.com>
Date: Fri, 18 Oct 2024 13:18:19 -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 01/10] net: qrtr: ns: validate msglen before ctrl_pkt use

The qrtr_ctrl_pkt structure is currently accessed without checking
if the received payload is large enough to hold the structure's fields.
Add a check to ensure the payload length is sufficient.

Signed-off-by: Denis Kenzior <denkenz@...il.com>
Reviewed-by: Marcel Holtmann <marcel@...tmann.org>
Reviewed-by: Andy Gross <agross@...nel.org>
---
 net/qrtr/ns.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
index 3de9350cbf30..6158e08c0252 100644
--- a/net/qrtr/ns.c
+++ b/net/qrtr/ns.c
@@ -619,6 +619,9 @@ static void qrtr_ns_worker(struct work_struct *work)
 			break;
 		}
 
+		if ((size_t)msglen < sizeof(pkt))
+			break;
+
 		pkt = recv_buf;
 		cmd = le32_to_cpu(pkt->cmd);
 		if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&
-- 
2.45.2