[PATCH 5.19 081/207] dmaengine: ti: k3-udma-private: Fix refcount leak bug in of_xudma_dev_get()

Greg Kroah-Hartman
2022-09-26T11:46:15Z

From: Liang He <windhl@126.com>

[ Upstream commit f9fdb0b86f087c2b7f6c6168dd0985a3c1eda87e ]

We should call of_node_put() for the reference returned by
of_parse_phandle() in fail path or when it is not used anymore.
Here we only need to move the of_node_put() before the check.

Fixes: d70241913413 ("dmaengine: ti: k3-udma: Add glue layer for non DMAengine users")
Signed-off-by: Liang He <windhl@126.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20220720073234.1255474-1-windhl@126.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/dma/ti/k3-udma-private.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ti/k3-udma-private.c b/drivers/dma/ti/k3-udma-private.c
index d4f1e4e9603a..85e00701473c 100644
--- a/drivers/dma/ti/k3-udma-private.c
+++ b/drivers/dma/ti/k3-udma-private.c
@@ -31,14 +31,14 @@ struct udma_dev *of_xudma_dev_get(struct device_node *np, const char *property)
}

pdev = of_find_device_by_node(udma_node);
+ if (np != udma_node)
+ of_node_put(udma_node);
+
if (!pdev) {
pr_debug("UDMA device not found\n");
return ERR_PTR(-EPROBE_DEFER);
}

- if (np != udma_node)
- of_node_put(udma_node);
-
ud = platform_get_drvdata(pdev);
if (!ud) {
pr_debug("UDMA has not been probed\n");
--
2.35.1