From: Houlong Wei <houlong.wei@mediatek.com>
Date: Tue, 21 Aug 2018 10:22:44 +0000 (+0800)
Subject: mailbox: mediatek: Add check for possible failure of kzalloc
X-Git-Tag: v4.19.99~601
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e60f60a4cde824604299cb60e83d623b78326ee5;p=thirdparty%2Fkernel%2Fstable.git

mailbox: mediatek: Add check for possible failure of kzalloc

[ 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@oracle.com>
Signed-off-by: Houlong Wei <houlong.wei@mediatek.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index aec46d5d35061..f7cc29c00302a 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;