* [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe
@ 2022-05-11 6:27 Miaoqian Lin
2022-05-11 7:36 ` Damien Le Moal
2022-05-11 11:46 ` Sergey Shtylyov
0 siblings, 2 replies; 3+ messages in thread
From: Miaoqian Lin @ 2022-05-11 6:27 UTC (permalink / raw)
To: Sergey Shtylyov, Damien Le Moal, Jeff Garzik, David Daney,
linux-ide, linux-kernel
Cc: linmq006
of_find_device_by_node() takes reference, we should use put_device()
to release it when not need anymore.
Add missing put_device() in error path to avoid refcount
leak.
Fixes: 43f01da0f279 ("MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
drivers/ata/pata_octeon_cf.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
index 6b5ed3046b44..65688459acf1 100644
--- a/drivers/ata/pata_octeon_cf.c
+++ b/drivers/ata/pata_octeon_cf.c
@@ -857,12 +857,14 @@ static int octeon_cf_probe(struct platform_device *pdev)
res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
if (!res_dma) {
of_node_put(dma_node);
+ put_device(&dma_dev->dev);
return -EINVAL;
}
cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start,
resource_size(res_dma));
if (!cf_port->dma_base) {
of_node_put(dma_node);
+ put_device(&dma_dev->dev);
return -EINVAL;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe
2022-05-11 6:27 [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe Miaoqian Lin
@ 2022-05-11 7:36 ` Damien Le Moal
2022-05-11 11:46 ` Sergey Shtylyov
1 sibling, 0 replies; 3+ messages in thread
From: Damien Le Moal @ 2022-05-11 7:36 UTC (permalink / raw)
To: Miaoqian Lin, Sergey Shtylyov, Jeff Garzik, David Daney,
linux-ide, linux-kernel
On 2022/05/11 8:27, Miaoqian Lin wrote:
> of_find_device_by_node() takes reference, we should use put_device()
> to release it when not need anymore.
> Add missing put_device() in error path to avoid refcount
> leak.
>
> Fixes: 43f01da0f279 ("MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
> drivers/ata/pata_octeon_cf.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
> index 6b5ed3046b44..65688459acf1 100644
> --- a/drivers/ata/pata_octeon_cf.c
> +++ b/drivers/ata/pata_octeon_cf.c
> @@ -857,12 +857,14 @@ static int octeon_cf_probe(struct platform_device *pdev)
> res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
> if (!res_dma) {
> of_node_put(dma_node);
> + put_device(&dma_dev->dev);
> return -EINVAL;
> }
> cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start,
> resource_size(res_dma));
> if (!cf_port->dma_base) {
> of_node_put(dma_node);
> + put_device(&dma_dev->dev);
> return -EINVAL;
> }
>
The extra reference should also be dropped at the end of the "if (dma_node)"
too, no ? Otherwise, early returns due to errors after that "if (dma_node)" will
also leak the extra ref.
Note that looking around at places where of_find_device_by_node() is being used,
very few users call put_device()... Looks like there are lots of device ref
leaks with that.
--
Damien Le Moal
Western Digital Research
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe
2022-05-11 6:27 [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe Miaoqian Lin
2022-05-11 7:36 ` Damien Le Moal
@ 2022-05-11 11:46 ` Sergey Shtylyov
1 sibling, 0 replies; 3+ messages in thread
From: Sergey Shtylyov @ 2022-05-11 11:46 UTC (permalink / raw)
To: Miaoqian Lin, Damien Le Moal, Jeff Garzik, David Daney, linux-ide,
linux-kernel
Hello!
On 5/11/22 9:27 AM, Miaoqian Lin wrote:
> of_find_device_by_node() takes reference, we should use put_device()
> to release it when not need anymore.
> Add missing put_device() in error path to avoid refcount
> leak.
>
> Fixes: 43f01da0f279 ("MIPS/OCTEON/ata: Convert pata_octeon_cf.c to use device tree.")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
> drivers/ata/pata_octeon_cf.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
> index 6b5ed3046b44..65688459acf1 100644
> --- a/drivers/ata/pata_octeon_cf.c
> +++ b/drivers/ata/pata_octeon_cf.c
> @@ -857,12 +857,14 @@ static int octeon_cf_probe(struct platform_device *pdev)
> res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
> if (!res_dma) {
> of_node_put(dma_node);
> + put_device(&dma_dev->dev);
> return -EINVAL;
> }
> cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start,
> resource_size(res_dma));
> if (!cf_port->dma_base) {
> of_node_put(dma_node);
> + put_device(&dma_dev->dev);
> return -EINVAL;
> }
>
It seems you forgot to call put_device() at the end of the enclosing *if*, where of_node_put()
is also called...
MBR, Sergey
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-05-11 6:27 [PATCH] ata: pata_octeon_cf: Fix refcount leak in octeon_cf_probe Miaoqian Lin
2022-05-11 7:36 ` Damien Le Moal
2022-05-11 11:46 ` Sergey Shtylyov
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