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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
	Vinod Koul <vkoul@kernel.org>, Sasha Levin <sashal@kernel.org>,
	dmaengine@vger.kernel.org
Subject: [PATCH AUTOSEL 5.1 10/11] dmaengine: jz4780: Fix an endian bug in IRQ handler
Date: Wed, 10 Jul 2019 11:02:37 -0400
Message-ID: <20190710150240.6984-10-sashal@kernel.org> (raw)
In-Reply-To: <20190710150240.6984-1-sashal@kernel.org>

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 4c89cc73d1da42ae48b5c5dfbfd12304d0b86786 ]

The "pending" variable was a u32 but we cast it to an unsigned long
pointer when we do the for_each_set_bit() loop.  The problem is that on
big endian 64bit systems that results in an out of bounds read.

Fixes: 4e4106f5e942 ("dmaengine: jz4780: Fix transfers being ACKed too soon")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/dma/dma-jz4780.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index f49534019d37..503d9f13ea97 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -722,12 +722,13 @@ static irqreturn_t jz4780_dma_irq_handler(int irq, void *data)
 {
 	struct jz4780_dma_dev *jzdma = data;
 	unsigned int nb_channels = jzdma->soc_data->nb_channels;
-	uint32_t pending, dmac;
+	unsigned long pending;
+	uint32_t dmac;
 	int i;
 
 	pending = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DIRQP);
 
-	for_each_set_bit(i, (unsigned long *)&pending, nb_channels) {
+	for_each_set_bit(i, &pending, nb_channels) {
 		if (jz4780_dma_chan_irq(jzdma, &jzdma->chan[i]))
 			pending &= ~BIT(i);
 	}
-- 
2.20.1


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190710150240.6984-1-sashal@kernel.org>
2019-07-10 15:02 ` Sasha Levin [this message]
2019-07-10 15:02 ` [PATCH AUTOSEL 5.1 11/11] dmaengine: imx-sdma: fix use-after-free on probe error path Sasha Levin

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