[PATCH v6 01/15] net: qrtr: ns: validate msglen before ctrl_pkt use

[Juha-Matti Tilli <juha-matti.tilli@iki.fi>]

From: Denis Kenzior <denkenz@gmail.com>

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@gmail.com>
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: Andy Gross <agross@kernel.org>
Signed-off-by: Mihai Moldovan <ionic@ionic.de>
Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
Signed-off-by: Juha-Matti Tilli <juha-matti.tilli@iki.fi>
---
 net/qrtr/ns.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
index e5b2adb161d92..d544e4998c5d5 100644
--- a/net/qrtr/ns.c
+++ b/net/qrtr/ns.c
@@ -668,6 +668,9 @@ 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) &&
-- 
2.34.1