[PATCH] dmaengine: Add a null pointer check to the dma_request_chan

[Kunwu Chan]

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.

Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
---
 drivers/dma/dmaengine.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 491b22240221..a6f808d13aa4 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -856,6 +856,8 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name)
 #ifdef CONFIG_DEBUG_FS
 	chan->dbg_client_name = kasprintf(GFP_KERNEL, "%s:%s", dev_name(dev),
 					  name);
+	if (!chan->dbg_client_name)
+		return chan;
 #endif
 
 	chan->name = kasprintf(GFP_KERNEL, "dma:%s", name);
-- 
2.39.2