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From: Yu Kuai <yukuai3@huawei.com>
To: <ludovic.desroches@microchip.com>, <tudor.ambarus@microchip.com>,
	<vkoul@kernel.org>, <dan.j.williams@intel.com>,
	<nicolas.ferre@microchip.com>, <plagnioj@jcrosoft.com>,
	<arnd@arndb.de>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<yi.zhang@huawei.com>, <yukuai3@huawei.com>
Subject: [PATCH 1/3] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate()
Date: Mon, 17 Aug 2020 19:57:26 +0800	[thread overview]
Message-ID: <20200817115728.1706719-2-yukuai3@huawei.com> (raw)
In-Reply-To: <20200817115728.1706719-1-yukuai3@huawei.com>

The reurn value of of_find_device_by_node() is not checked, thus null
pointer dereference will be triggered if of_find_device_by_node()
failed.

Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/dma/at_hdmac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 45bbcd6146fd..1c941f839c42 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1650,6 +1650,8 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
 		return NULL;
 
 	dmac_pdev = of_find_device_by_node(dma_spec->np);
+	if (!dmac_pdev)
+		return NULL;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
-- 
2.25.4


WARNING: multiple messages have this Message-ID (diff)
From: Yu Kuai <yukuai3@huawei.com>
To: <ludovic.desroches@microchip.com>, <tudor.ambarus@microchip.com>,
	<vkoul@kernel.org>, <dan.j.williams@intel.com>,
	<nicolas.ferre@microchip.com>, <plagnioj@jcrosoft.com>,
	<arnd@arndb.de>
Cc: dmaengine@vger.kernel.org, yukuai3@huawei.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, yi.zhang@huawei.com
Subject: [PATCH 1/3] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate()
Date: Mon, 17 Aug 2020 19:57:26 +0800	[thread overview]
Message-ID: <20200817115728.1706719-2-yukuai3@huawei.com> (raw)
In-Reply-To: <20200817115728.1706719-1-yukuai3@huawei.com>

The reurn value of of_find_device_by_node() is not checked, thus null
pointer dereference will be triggered if of_find_device_by_node()
failed.

Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/dma/at_hdmac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 45bbcd6146fd..1c941f839c42 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1650,6 +1650,8 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
 		return NULL;
 
 	dmac_pdev = of_find_device_by_node(dma_spec->np);
+	if (!dmac_pdev)
+		return NULL;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
-- 
2.25.4


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  reply	other threads:[~2020-08-17 11:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 11:57 [PATCH V2 0/3] do exception handling appropriately in at_dma_xlate() Yu Kuai
2020-08-17 11:57 ` Yu Kuai
2020-08-17 11:57 ` Yu Kuai [this message]
2020-08-17 11:57   ` [PATCH 1/3] dmaengine: at_hdmac: check return value of of_find_device_by_node() " Yu Kuai
2020-08-17 11:57 ` [PATCH 2/3] dmaengine: at_hdmac: add missing put_device() call " Yu Kuai
2020-08-17 11:57   ` Yu Kuai
2020-08-17 11:57 ` [PATCH 3/3] dmaengine: at_hdmac: add missing kfree() " Yu Kuai
2020-08-17 11:57   ` Yu Kuai
2020-08-19  4:29 ` [PATCH V2 0/3] do exception handling appropriately " Vinod Koul
2020-08-19  4:29   ` Vinod Koul

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