[PATCH] dmaengine: idxd: Fix dereference on uninitialized pointer conf_dev

[Colin Ian King <colin.i.king@gmail.com>]

Currently if the allocation for wq fails on the initial iteration in
the setup loop the error exit path to err will call put_device on
an uninitialized pointer conf_dev. Fix this by initializing conf_dev
to NULL, note that put_device will ignore a NULL device pointer so no
null pointer dereference issues occur on this call.

Fixes: 3fd2f4bc010c ("dmaengine: idxd: fix memory leak in error handling path of idxd_setup_wqs")

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 drivers/dma/idxd/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 35bdefd3728b..2b61f26af1f6 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -178,7 +178,7 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 {
 	struct device *dev = &idxd->pdev->dev;
 	struct idxd_wq *wq;
-	struct device *conf_dev;
+	struct device *conf_dev = NULL;
 	int i, rc;
 
 	idxd->wqs = kcalloc_node(idxd->max_wqs, sizeof(struct idxd_wq *),
-- 
2.50.1