[PATCH] block: partitions: fix of_node refcount leak in of_partition()

[PATCH] block: partitions: fix of_node refcount leak in of_partition()

[Wentao Liang]

of_partition() calls of_node_get() on the parent device node at the
beginning of the function, storing the reference in 'partitions_np'.
This reference is leaked in two paths:

1. The compatibility check at the top of the function returns 0
   without releasing partitions_np when the node exists but is not
   "fixed-partitions" compatible.

2. The function returns 1 at the end after successfully processing
   all partitions without releasing partitions_np.

Fix both leaks by adding of_node_put(partitions_np) on each path.

Fixes: 2e3a191e89f9 ("block: add support for partition table defined in OF")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 block/partitions/of.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/partitions/of.c b/block/partitions/of.c
index c22b60661098..53664ea06b65 100644
--- a/block/partitions/of.c
+++ b/block/partitions/of.c
@@ -74,8 +74,10 @@ int of_partition(struct parsed_partitions *state)
 	struct device_node *partitions_np = of_node_get(ddev->of_node);
 
 	if (!partitions_np ||
-	    !of_device_is_compatible(partitions_np, "fixed-partitions"))
+	    !of_device_is_compatible(partitions_np, "fixed-partitions")) {
+		of_node_put(partitions_np);
 		return 0;
+	}
 
 	slot = 1;
 	/* Validate parition offset and size */
@@ -104,5 +106,6 @@ int of_partition(struct parsed_partitions *state)
 
 	seq_buf_puts(&state->pp_buf, "\n");
 
+	of_node_put(partitions_np);
 	return 1;
 }
-- 
2.34.1

Re: [PATCH] block: partitions: fix of_node refcount leak in of_partition()

[Haris Iqbal]

On 5/26/26 12:21, Wentao Liang wrote:
> of_partition() calls of_node_get() on the parent device node at the
> beginning of the function, storing the reference in 'partitions_np'.
> This reference is leaked in two paths:
> 
> 1. The compatibility check at the top of the function returns 0
>     without releasing partitions_np when the node exists but is not
>     "fixed-partitions" compatible.
> 
> 2. The function returns 1 at the end after successfully processing
>     all partitions without releasing partitions_np.
> 
> Fix both leaks by adding of_node_put(partitions_np) on each path.
> 
> Fixes: 2e3a191e89f9 ("block: add support for partition table defined in OF")
> Cc: stable@vger.kernel.org
> Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>

Looks good:

Reviewed-by: Md Haris Iqbal <haris.iqbal@linux.dev>

> ---
>   block/partitions/of.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/block/partitions/of.c b/block/partitions/of.c
> index c22b60661098..53664ea06b65 100644
> --- a/block/partitions/of.c
> +++ b/block/partitions/of.c
> @@ -74,8 +74,10 @@ int of_partition(struct parsed_partitions *state)
>   	struct device_node *partitions_np = of_node_get(ddev->of_node);
>   
>   	if (!partitions_np ||
> -	    !of_device_is_compatible(partitions_np, "fixed-partitions"))
> +	    !of_device_is_compatible(partitions_np, "fixed-partitions")) {
> +		of_node_put(partitions_np);
>   		return 0;
> +	}
>   
>   	slot = 1;
>   	/* Validate parition offset and size */
> @@ -104,5 +106,6 @@ int of_partition(struct parsed_partitions *state)
>   
>   	seq_buf_puts(&state->pp_buf, "\n");
>   
> +	of_node_put(partitions_np);
>   	return 1;
>   }

Re: [PATCH] block: partitions: fix of_node refcount leak in of_partition()

[Jens Axboe]

On Tue, 26 May 2026 10:21:24 +0000, Wentao Liang wrote:
> of_partition() calls of_node_get() on the parent device node at the
> beginning of the function, storing the reference in 'partitions_np'.
> This reference is leaked in two paths:
> 
> 1. The compatibility check at the top of the function returns 0
>    without releasing partitions_np when the node exists but is not
>    "fixed-partitions" compatible.
> 
> [...]

Applied, thanks!

[1/1] block: partitions: fix of_node refcount leak in of_partition()
      commit: 148cd4873115feb266c002d4d4618ea7f14342d9

Best regards,
-- 
Jens Axboe