linux-kernel - [PATCH] platform/mellanox: mlxreg-lc: Check before variable dereferenced

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Message-ID: <20231130094409.3963-1-u202112062@hust.edu.cn>
Date:   Thu, 30 Nov 2023 17:44:07 +0800
From:   Yu Sun <u202112062@...t.edu.cn>
To:     Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Yu Sun <u202112062@...t.edu.cn>,
        Dongliang Mu <dzm91@...t.edu.cn>,
        Dan Carpenter <error27@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] platform/mellanox: mlxreg-lc: Check before variable dereferenced

there is a warning saying variable dereferenced before
check 'data->notifier' in line 828.
add "for(data->notifier)" before variable deferenced.

Signed-off-by: Yu Sun <u202112062@...t.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
Reviewed-by: Dan Carpenter <error27@...il.com>
---
 drivers/platform/mellanox/mlxreg-lc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/mellanox/mlxreg-lc.c b/drivers/platform/mellanox/mlxreg-lc.c
index 43d119e3a473..e92add40750b 100644
--- a/drivers/platform/mellanox/mlxreg-lc.c
+++ b/drivers/platform/mellanox/mlxreg-lc.c
@@ -824,9 +824,12 @@ static int mlxreg_lc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mutex_init(&mlxreg_lc->lock);
-	/* Set event notification callback. */
-	data->notifier->user_handler = mlxreg_lc_event_handler;
-	data->notifier->handle = mlxreg_lc;
+
+	if (data->notifier) {
+		/* Set event notification callback. */
+		data->notifier->user_handler = mlxreg_lc_event_handler;
+		data->notifier->handle = mlxreg_lc;
+	}
 
 	data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr);
 	if (!data->hpdev.adapter) {
-- 
2.42.0