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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>
This commit is contained in:
Franck Jullien 2016-03-22 11:52:22 +01:00 committed by Vinod Koul
parent f55532a0c0
commit 330ed4da2c
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/xilinx/xilinx_vdma.c
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@ -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);