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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Yang Yingliang <yangyingliang@huawei.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 197/452] spi: spi-fsl-qspi: check return value after calling platform_get_resource_byname()
Date:   Tue,  7 Jun 2022 19:00:54 +0200
Message-Id: <20220607164914.435376679@linuxfoundation.org>
In-Reply-To: <20220607164908.521895282@linuxfoundation.org>
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From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit a2b331ac11e1cac56f5b7d367e9f3c5796deaaed ]

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

Fixes: 858e26a515c2 ("spi: spi-fsl-qspi: Reduce devm_ioremap size to 4 times AHB buffer size")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220505093954.1285615-1-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/spi-fsl-qspi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c
index 9851551ebbe0..46ae46a944c5 100644
--- a/drivers/spi/spi-fsl-qspi.c
+++ b/drivers/spi/spi-fsl-qspi.c
@@ -876,6 +876,10 @@ static int fsl_qspi_probe(struct platform_device *pdev)
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 					"QuadSPI-memory");
+	if (!res) {
+		ret = -EINVAL;
+		goto err_put_ctrl;
+	}
 	q->memmap_phy = res->start;
 	/* Since there are 4 cs, map size required is 4 times ahb_buf_size */
 	q->ahb_addr = devm_ioremap(dev, q->memmap_phy,
-- 
2.35.1