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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Yang Yingliang <yangyingliang@huawei.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>, alsa-devel@alsa-project.org,
        linuxppc-dev@lists.ozlabs.org
Subject: [PATCH AUTOSEL 5.12 091/104] ASoC: fsl_xcvr: check return value after calling platform_get_resource_byname()
Date:   Fri,  9 Jul 2021 22:21:43 -0400
Message-Id: <20210710022156.3168825-91-sashal@kernel.org>
In-Reply-To: <20210710022156.3168825-1-sashal@kernel.org>
References: <20210710022156.3168825-1-sashal@kernel.org>
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From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit a2f6ed4a44721d3a9fdf4da7e0743cb13866bf61 ]

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

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210615013922.784296-10-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/fsl/fsl_xcvr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index 6dd0a5fcd455..dc7f914816c6 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -1205,6 +1205,10 @@ static int fsl_xcvr_probe(struct platform_device *pdev)
 
 	rx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rxfifo");
 	tx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "txfifo");
+	if (!rx_res || !tx_res) {
+		dev_err(dev, "could not find rxfifo or txfifo resource\n");
+		return -EINVAL;
+	}
 	xcvr->dma_prms_rx.chan_name = "rx";
 	xcvr->dma_prms_tx.chan_name = "tx";
 	xcvr->dma_prms_rx.addr = rx_res->start;
-- 
2.30.2