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dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate()

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[ Upstream commit 0cef8e2c5a07d482ec907249dbd6687e8697677f ]

The reurn value of of_find_device_by_node() is not checked, thus null
pointer dereference will be triggered if of_find_device_by_node()
failed.

Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20200817115728.1706719-2-yukuai3@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai 2020-08-17 19:57:26 +08:00 committed by Greg Kroah-Hartman
parent 3eabc73c4a
commit cd8c3a766b
1 changed files with 2 additions and 0 deletions
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2
drivers/dma/at_hdmac.c
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@ -1677,6 +1677,8 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
return NULL;
dmac_pdev = of_find_device_by_node(dma_spec->np);
if (!dmac_pdev)
return NULL;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);