linux-kernel - [PATCH 3/3] mtd: rawnand: tmio: check return value after calling platform_get

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Date:   Tue, 26 Apr 2022 16:49:13 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>
Subject: [PATCH 3/3] mtd: rawnand: tmio: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/mtd/nand/raw/tmio_nand.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/nand/raw/tmio_nand.c b/drivers/mtd/nand/raw/tmio_nand.c
index de8e919d0ebe..8f1a42bf199c 100644
--- a/drivers/mtd/nand/raw/tmio_nand.c
+++ b/drivers/mtd/nand/raw/tmio_nand.c
@@ -390,6 +390,9 @@ static int tmio_probe(struct platform_device *dev)
 	if (data == NULL)
 		dev_warn(&dev->dev, "NULL platform data!\n");
 
+	if (!ccr || !fcr)
+		return -EINVAL;
+
 	tmio = devm_kzalloc(&dev->dev, sizeof(*tmio), GFP_KERNEL);
 	if (!tmio)
 		return -ENOMEM;
-- 
2.25.1