linux-kernel - [PATCH v2] ata: pata_octeon_cf: Fix refcount leak in octeon_cf

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Date:   Wed,  1 Jun 2022 12:59:26 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jeff Garzik <jgarzik@...hat.com>,
        David Daney <david.daney@...ium.com>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH v2] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe

of_find_device_by_node() takes reference, we should use put_device()
to release it when not need anymore.
Add missing put_device() to avoid refcount leak.

Fixes: 43f01da0f279 ("MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- Add put_device() at the end of if (dma_dev).
  we need the null check and do handling only if dma_dev!=NULL.
- call put_device before of_node_put() in error path. keep the
  reverse order of resource allocation.

v1 link:
https://lore.kernel.org/all/20220511062723.56652-1-linmq006@gmail.com/
---
 drivers/ata/pata_octeon_cf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
index 6b5ed3046b44..35608a0cf552 100644
--- a/drivers/ata/pata_octeon_cf.c
+++ b/drivers/ata/pata_octeon_cf.c
@@ -856,12 +856,14 @@ static int octeon_cf_probe(struct platform_device *pdev)
 				int i;
 				res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
 				if (!res_dma) {
+					put_device(&dma_dev->dev);
 					of_node_put(dma_node);
 					return -EINVAL;
 				}
 				cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start,
 									 resource_size(res_dma));
 				if (!cf_port->dma_base) {
+					put_device(&dma_dev->dev);
 					of_node_put(dma_node);
 					return -EINVAL;
 				}
@@ -871,6 +873,7 @@ static int octeon_cf_probe(struct platform_device *pdev)
 					irq = i;
 					irq_handler = octeon_cf_interrupt;
 				}
+				put_device(&dma_dev->dev);
 			}
 			of_node_put(dma_node);
 		}
-- 
2.25.1