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dmaengine: jz4780: Fix an endian bug in IRQ handler

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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: 4e4106f5e9 ("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>
This commit is contained in:
Dan Carpenter 2019-06-24 16:49:40 +03:00 committed by Vinod Koul
parent d1fdb6d8f6
commit 4c89cc73d1
1 changed files with 3 additions and 2 deletions
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5
drivers/dma/dma-jz4780.c
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@ -718,12 +718,13 @@ 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);
}