linux-kernel - [PATCH] staging: vchiq_arm: Utilize devm

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Message-ID: <20241013171613.457070-1-umang.jain@ideasonboard.com>
Date: Sun, 13 Oct 2024 22:46:13 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	kernel-list@...pberrypi.com,
	Stefan Wahren <wahrenst@....net>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Umang Jain <umang.jain@...asonboard.com>,
	stable@...r.kernel.org
Subject: [PATCH] staging: vchiq_arm: Utilize devm_kzalloc in the probe() function

The two resources, 'mgmt' and 'platform_state' are currently allocated
dynamically using kzalloc(). Unfortunately, both are subject to memory
leaks in the error handling paths of the probe() function.

To address this issue, use device resource management helper devm_kzalloc()
for proper cleanup during allocation.

Cc: stable@...r.kernel.org
Fixes: 1c9e16b73166 ("staging: vc04_services: vchiq_arm: Split driver static and runtime data")
Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c   | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 29e78700463f..373cfdd5b020 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -285,7 +285,7 @@ vchiq_platform_init_state(struct vchiq_state *state)
 {
 	struct vchiq_arm_state *platform_state;
 
-	platform_state = kzalloc(sizeof(*platform_state), GFP_KERNEL);
+	platform_state = devm_kzalloc(state->dev, sizeof(*platform_state), GFP_KERNEL);
 	if (!platform_state)
 		return -ENOMEM;
 
@@ -1344,7 +1344,7 @@ static int vchiq_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	mgmt = kzalloc(sizeof(*mgmt), GFP_KERNEL);
+	mgmt = devm_kzalloc(&pdev->dev, sizeof(*mgmt), GFP_KERNEL);
 	if (!mgmt)
 		return -ENOMEM;
 
@@ -1402,8 +1402,6 @@ static void vchiq_remove(struct platform_device *pdev)
 
 	arm_state = vchiq_platform_get_arm_state(&mgmt->state);
 	kthread_stop(arm_state->ka_thread);
-
-	kfree(mgmt);
 }
 
 static struct platform_driver vchiq_driver = {
-- 
2.45.2