linux-kernel - [PATCH AUTOSEL 4.19 018/671] mailbox: mediatek: Add check for possible failure of kzalloc

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Message-Id: <20200116165502.8838-18-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 11:44:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Houlong Wei <houlong.wei@...iatek.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 018/671] mailbox: mediatek: Add check for possible failure of kzalloc

From: Houlong Wei <houlong.wei@...iatek.com>

[ Upstream commit 9f0a0a381c5db56e7922dbeea6831f27db58372f ]

The patch 623a6143a845("mailbox: mediatek: Add Mediatek CMDQ driver")
introduce the following static checker warning:
  drivers/mailbox/mtk-cmdq-mailbox.c:366 cmdq_mbox_send_data()
  error: potential null dereference 'task'.  (kzalloc returns null)

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Houlong Wei <houlong.wei@...iatek.com>
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index aec46d5d3506..f7cc29c00302 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -363,6 +363,9 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
 	WARN_ON(cmdq->suspended);
 
 	task = kzalloc(sizeof(*task), GFP_ATOMIC);
+	if (!task)
+		return -ENOMEM;
+
 	task->cmdq = cmdq;
 	INIT_LIST_HEAD(&task->list_entry);
 	task->pa_base = pkt->pa_base;
-- 
2.20.1