dmaengine: vdma: don't crash when bad channel is requested

When client request a non existing channel from of_dma_xilinx_xlate
we get a NULL pointer dereferencing. This patch fix this problem.

Signed-off-by: Franck Jullien <franck.jullien@odyssee-systemes.fr>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c
index 0ee0321868d3..ef67f278e076 100644
--- a/drivers/dma/xilinx/xilinx_vdma.c
+++ b/drivers/dma/xilinx/xilinx_vdma.c
@@ -1236,7 +1236,7 @@ static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
         struct xilinx_vdma_device *xdev = ofdma->of_dma_data;
         int chan_id = dma_spec->args[0];
 
-        if (chan_id >= XILINX_VDMA_MAX_CHANS_PER_DEVICE)
+        if (chan_id >= XILINX_VDMA_MAX_CHANS_PER_DEVICE || !xdev->chan[chan_id])
                 return NULL;
 
         return dma_get_slave_channel(&xdev->chan[chan_id]->common);