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From: haibo.chen@nxp.com
To: adrian.hunter@intel.com, ulf.hansson@linaro.org,
	linux-mmc@vger.kernel.org, jh80.chung@samsung.com,
	kgene@kernel.org, krzk@kernel.org, michal.simek@xilinx.com,
	linux-samsung-soc@vger.kernel.org
Cc: linux-imx@nxp.com, haibo.chen@nxp.com
Subject: [PATCH] mmc: host: dereference null return value
Date: Tue, 23 Jun 2020 12:06:49 +0800
Message-ID: <1592885209-25839-1-git-send-email-haibo.chen@nxp.com> (raw)

From: Haibo Chen <haibo.chen@nxp.com>

of_match_node() has the opportunity to return NULL, so need to
dereference null return value.
This is reported by Coverity.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/mmc/host/dw_mmc-exynos.c   | 5 +++--
 drivers/mmc/host/dw_mmc-k3.c       | 5 +++--
 drivers/mmc/host/dw_mmc-pltfm.c    | 3 ++-
 drivers/mmc/host/sdhci-of-arasan.c | 2 ++
 4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index 5e3d95b63676..27ab55abb03f 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -545,12 +545,13 @@ MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
 
 static int dw_mci_exynos_probe(struct platform_device *pdev)
 {
-	const struct dw_mci_drv_data *drv_data;
+	const struct dw_mci_drv_data *drv_data = NULL;
 	const struct of_device_id *match;
 	int ret;
 
 	match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
-	drv_data = match->data;
+	if (match)
+		drv_data = match->data;
 
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 50977ff18074..e8a148c306b3 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -451,11 +451,12 @@ MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
 
 static int dw_mci_k3_probe(struct platform_device *pdev)
 {
-	const struct dw_mci_drv_data *drv_data;
+	const struct dw_mci_drv_data *drv_data = NULL;
 	const struct of_device_id *match;
 
 	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
-	drv_data = match->data;
+	if (match)
+		drv_data = match->data;
 
 	return dw_mci_pltfm_register(pdev, drv_data);
 }
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
index 7de37f524a96..d3dcb96efd13 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -78,7 +78,8 @@ static int dw_mci_pltfm_probe(struct platform_device *pdev)
 
 	if (pdev->dev.of_node) {
 		match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
-		drv_data = match->data;
+		if (match)
+			drv_data = match->data;
 	}
 
 	return dw_mci_pltfm_register(pdev, drv_data);
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index fb26e743e1fd..f2090f944a0e 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -1520,6 +1520,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	const struct sdhci_arasan_of_data *data;
 
 	match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node);
+	if (match == NULL)
+		return -ENOPARAM;
 	data = match->data;
 	host = sdhci_pltfm_init(pdev, data->pdata, sizeof(*sdhci_arasan));
 
-- 
2.17.1


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200623041836eucas1p2792e1fe062f8dd59af0ec18b8af1c1ef@eucas1p2.samsung.com>
2020-06-23  4:06 ` haibo.chen [this message]
2020-07-01 10:33   ` Adrian Hunter
2020-07-01 10:57   ` Marek Szyprowski

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