linux-kernel - [PATCH 5.1 94/96] dmaengine: jz4780: Fix an endian bug in IRQ handler

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Message-Id: <20190708150531.511815773@linuxfoundation.org>
Date:   Mon,  8 Jul 2019 17:14:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.1 94/96] dmaengine: jz4780: Fix an endian bug in IRQ handler

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

commit 4c89cc73d1da42ae48b5c5dfbfd12304d0b86786 upstream.

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@...cle.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/dma-jz4780.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -722,12 +722,13 @@ static irqreturn_t jz4780_dma_irq_handle
 {
 	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);
 	}