linux-kernel - [PATCH v3 1/2] dmaengine: ti: Fix refcount leak in ti_dra7_xbar_route

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Message-Id: <20220605042723.17668-2-linmq006@gmail.com>
Date:   Sun,  5 Jun 2022 08:27:23 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH v3 1/2] dmaengine: ti: Fix refcount leak in ti_dra7_xbar_route_allocate

of_parse_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not needed anymore.

Add missing of_node_put() in to fix this.

Fixes: ec9bfa1e1a79 ("dmaengine: ti-dma-crossbar: dra7: Use bitops instead of idr")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
v3 has no changes, just assemble two patches into a series so I keep
version consistent.

changes in v2:
- split v1 into two patches.
v1 link: https://lore.kernel.org/r/20220512051815.11946-1-linmq006@gmail.com
v2 link: https://lore.kernel.org/r/20220601105546.53068-1-linmq006@gmail.com
---
 drivers/dma/ti/dma-crossbar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/ti/dma-crossbar.c b/drivers/dma/ti/dma-crossbar.c
index 71d24fc07c00..e34cfb50d241 100644
--- a/drivers/dma/ti/dma-crossbar.c
+++ b/drivers/dma/ti/dma-crossbar.c
@@ -268,6 +268,7 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
 		mutex_unlock(&xbar->mutex);
 		dev_err(&pdev->dev, "Run out of free DMA requests\n");
 		kfree(map);
+		of_node_put(dma_spec->np);
 		return ERR_PTR(-ENOMEM);
 	}
 	set_bit(map->xbar_out, xbar->dma_inuse);
-- 
2.25.1