From: Dan Carpenter dan.carpenter@oracle.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@oracle.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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); }