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dmaengine: fix null ptr check for __dma_async_device_channel_register()

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Add check to pointer after assignment before accessing members.

Fixes: d2fb0a0438: ("dmaengine: break out channel registration")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/158049351973.45445.3291586905226032744.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2020-01-31 10:58:39 -07:00 • committed by Vinod Koul
parent a9113a90f5
commit 5429b51f60
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/dmaengine.c
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@ -962,6 +962,9 @@ static int __dma_async_device_channel_register(struct dma_device *device,
tchan = list_first_entry_or_null(&device->channels,
struct dma_chan, device_node);
if (!tchan)
return -ENODEV;
if (tchan->dev) {
idr_ref = tchan->dev->idr_ref;
} else {