linux-kernel - [PATCH] drivers: core: fix device leak in __fw_devlink_relax

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Message-Id: <20250212-fix__fw_devlink_relax_cycles_missing_device_put-v1-1-41818c7d7722@bootlin.com>
Date: Wed, 12 Feb 2025 11:31:34 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Saravana Kannan <saravanak@...gle.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Hervé Codina <herve.codina@...tlin.com>, 
 linux-kernel@...r.kernel.org, Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH] drivers: core: fix device leak in
 __fw_devlink_relax_cycles()

Commit bac3b10b78e5 ("driver core: fw_devlink: Stop trying to optimize
cycle detection logic") introduced a new struct device *con_dev and a
get_dev_from_fwnode() call to get it, but without adding a corresponding
put_device().

Link: https://lore.kernel.org/all/20241204124826.2e055091@booty/
Fixes: bac3b10b78e5 ("driver core: fw_devlink: Stop trying to optimize cycle detection logic")
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
 drivers/base/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 5a1f051981149dc5b5eee4fb69c0ab748a85956d..2fde698430dff98b5e30f7be7d43d310289c4217 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2079,6 +2079,7 @@ static bool __fw_devlink_relax_cycles(struct fwnode_handle *con_handle,
 out:
 	sup_handle->flags &= ~FWNODE_FLAG_VISITED;
 	put_device(sup_dev);
+	put_device(con_dev);
 	put_device(par_dev);
 	return ret;
 }

---
base-commit: 09fbf3d502050282bf47ab3babe1d4ed54dd1fd8
change-id: 20250212-fix__fw_devlink_relax_cycles_missing_device_put-37cae5f4aac0

Best regards,
-- 
Luca Ceresoli <luca.ceresoli@...tlin.com>