diff mbox series

[1/3] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate()

Message ID 20200817115728.1706719-2-yukuai3@huawei.com (mailing list archive)
State New, archived
Headers show
Series do exception handling appropriately in at_dma_xlate() | expand

Commit Message

Yu Kuai Aug. 17, 2020, 11:57 a.m. UTC 
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>
---
 drivers/dma/at_hdmac.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 45bbcd6146fd..1c941f839c42 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1650,6 +1650,8 @@  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);