linux-kernel - [PATCH 5.12 008/127] platform/x86: ideapad-laptop: fix a NULL pointer dereference

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Date:   Mon, 24 May 2021 17:25:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qiu Wenbo <qiuwenbo@...inos.com.cn>,
        Ike Panhc <ike.pan@...onical.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 008/127] platform/x86: ideapad-laptop: fix a NULL pointer dereference

From: Qiu Wenbo <qiuwenbo@...inos.com.cn>

[ Upstream commit ff67dbd554b2aaa22be933eced32610ff90209dd ]

The third parameter of dytc_cql_command should not be NULL since it will
be dereferenced immediately.

Fixes: ff36b0d953dc4 ("platform/x86: ideapad-laptop: rework and create new ACPI helpers")
Signed-off-by: Qiu Wenbo <qiuwenbo@...inos.com.cn>
Acked-by: Ike Panhc <ike.pan@...onical.com>
Link: https://lore.kernel.org/r/20210428050636.8003-1-qiuwenbo@kylinos.com.cn
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/ideapad-laptop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 6cb5ad4be231..8f871151f0cc 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -809,6 +809,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
 {
 	struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof);
 	struct ideapad_private *priv = dytc->priv;
+	unsigned long output;
 	int err;
 
 	err = mutex_lock_interruptible(&dytc->mutex);
@@ -829,7 +830,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
 
 		/* Determine if we are in CQL mode. This alters the commands we do */
 		err = dytc_cql_command(priv, DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1),
-				       NULL);
+				       &output);
 		if (err)
 			goto unlock;
 	}
-- 
2.30.2