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From: Aditya Pakki <pakki001@umn.edu>
To: pakki001@umn.edu
Cc: kjlu@umn.edu, Jaehoon Chung <jh80.chung@samsung.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] mmc: dw_mmc: Fix to avoid potential NULL pointer dereference
Date: Mon, 18 Mar 2019 19:19:18 -0500	[thread overview]
Message-ID: <20190319001918.12042-1-pakki001@umn.edu> (raw)

of_match_node can fail and return NULL in case no matching structure.
The patches checks for such a scenario and returns -ENXIO.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
 drivers/mmc/host/dw_mmc-exynos.c | 2 ++
 drivers/mmc/host/dw_mmc-k3.c     | 2 ++
 drivers/mmc/host/dw_mmc-pltfm.c  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index d46c3439b508..8a75d7314606 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -554,6 +554,8 @@ static int dw_mci_exynos_probe(struct platform_device *pdev)
 	int ret;
 
 	match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 	drv_data = match->data;
 
 	pm_runtime_get_noresume(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 89cdb3d533bb..cc50b7546a20 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -459,6 +459,8 @@ static int dw_mci_k3_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 
 	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 	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 58c13e21bd5a..b1948989f617 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -82,6 +82,8 @@ 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);
+		if (!match)
+			return -ENXIO;
 		drv_data = match->data;
 	}
 
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Aditya Pakki <pakki001@umn.edu>
To: pakki001@umn.edu
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
	linux-samsung-soc@vger.kernel.org, kjlu@umn.edu,
	linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Jaehoon Chung <jh80.chung@samsung.com>,
	Kukjin Kim <kgene@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: dw_mmc: Fix to avoid potential NULL pointer dereference
Date: Mon, 18 Mar 2019 19:19:18 -0500	[thread overview]
Message-ID: <20190319001918.12042-1-pakki001@umn.edu> (raw)

of_match_node can fail and return NULL in case no matching structure.
The patches checks for such a scenario and returns -ENXIO.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
 drivers/mmc/host/dw_mmc-exynos.c | 2 ++
 drivers/mmc/host/dw_mmc-k3.c     | 2 ++
 drivers/mmc/host/dw_mmc-pltfm.c  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index d46c3439b508..8a75d7314606 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -554,6 +554,8 @@ static int dw_mci_exynos_probe(struct platform_device *pdev)
 	int ret;
 
 	match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 	drv_data = match->data;
 
 	pm_runtime_get_noresume(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 89cdb3d533bb..cc50b7546a20 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -459,6 +459,8 @@ static int dw_mci_k3_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 
 	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
+	if (!match)
+		return -ENXIO;
 	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 58c13e21bd5a..b1948989f617 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -82,6 +82,8 @@ 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);
+		if (!match)
+			return -ENXIO;
 		drv_data = match->data;
 	}
 
-- 
2.17.1


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             reply	other threads:[~2019-03-19  0:19 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-19  0:19 Aditya Pakki [this message]
2019-03-19  0:19 ` [PATCH] mmc: dw_mmc: Fix to avoid potential NULL pointer dereference Aditya Pakki
2019-03-19  0:43 ` [PATCH] mmc: dw_mmc: Fix to avoid potential NULL pointer dereference【请注意，邮件由linux-mmc-owner@vger.kernel.org代发】 Shawn Lin
2019-03-19  0:43   ` Shawn Lin

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