spi: spi-fsl-qspi: check return value after calling platform_get_resource_byname()

[ 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>

diff --git a/drivers/spi/spi-fsl-qspi.c b/drivers/spi/spi-fsl-qspi.c
index 9851551ebbe05d9381d3344469df10242f52b4dd..46ae46a944c5ce89818ddef2f2a622a96ee95036 100644 (file)
--- 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,