linux-kernel - [PATCH] Input: psmouse - fix psmouse detect function is a NULL pointer

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Message-Id: <20210519032335.19326-1-maqianga@uniontech.com>
Date:   Wed, 19 May 2021 11:23:35 +0800
From:   Qiang Ma <maqianga@...ontech.com>
To:     dmitry.torokhov@...il.com, wangxiongfeng2@...wei.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qiang Ma <maqianga@...ontech.com>
Subject: [PATCH] Input: psmouse - fix psmouse detect function is a NULL pointer

Add a check for psmouse_do_detect(), when the detect is NULL pointer,
returning false, avoiding this possible NULL pointer exception.

Signed-off-by: Qiang Ma <maqianga@...ontech.com>
---
 drivers/input/mouse/psmouse-base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index 0b4a3039f312..86b095728587 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -1006,6 +1006,9 @@ static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
 	if (set_properties)
 		psmouse_apply_defaults(psmouse);
 
+	if (!detect)
+		return false;
+
 	return detect(psmouse, set_properties) == 0;
 }
 
-- 
2.20.1