linux-kernel - [PATCH net-next 3/3] net: ti: icss-iep: Fix possible NULL pointer dereference for perout request

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Message-ID: <20250317101551.1005706-4-m-malladi@ti.com>
Date: Mon, 17 Mar 2025 15:45:50 +0530
From: Meghana Malladi <m-malladi@...com>
To: <pabeni@...hat.com>, <kuba@...nel.org>, <edumazet@...gle.com>,
        <davem@...emloft.net>, <andrew+netdev@...n.ch>
CC: <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <kory.maincent@...tlin.com>, <javier.carrasco.cruz@...il.com>,
        <diogo.ivo@...mens.com>, <horms@...nel.org>,
        <jacob.e.keller@...el.com>, <m-malladi@...com>,
        <john.fastabend@...il.com>, <hawk@...nel.org>, <daniel@...earbox.net>,
        <ast@...nel.org>, <srk@...com>, Vignesh Raghavendra
	<vigneshr@...com>,
        Roger Quadros <rogerq@...nel.org>, <danishanwar@...com>
Subject: [PATCH net-next 3/3] net: ti: icss-iep: Fix possible NULL pointer dereference for perout request

Whenever there is a perout request from the user application,
kernel receives req structure containing the configuration info
for that req. Add NULL pointer handling for perout request if
that req struct points to NULL.

Fixes: e5b456a14215 ("net: ti: icss-iep: Add pwidth configuration for perout signal")
Signed-off-by: Meghana Malladi <m-malladi@...com>
---
 drivers/net/ethernet/ti/icssg/icss_iep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/icssg/icss_iep.c b/drivers/net/ethernet/ti/icssg/icss_iep.c
index b4a34c57b7b4..aeebdc4c121e 100644
--- a/drivers/net/ethernet/ti/icssg/icss_iep.c
+++ b/drivers/net/ethernet/ti/icssg/icss_iep.c
@@ -498,6 +498,10 @@ static int icss_iep_perout_enable(struct icss_iep *iep,
 {
 	int ret = 0;
 
+	/* Return error if the req is NULL */
+	if (!req)
+		return -EINVAL;
+
 	/* Reject requests with unsupported flags */
 	if (req->flags & ~(PTP_PEROUT_DUTY_CYCLE |
 			  PTP_PEROUT_PHASE))
-- 
2.43.0