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staging: vchiq_arm: Fix missing refcount decrement in error path for fw_node

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commit 22a3703af1 upstream.

An error path was introduced without including the required call to
of_node_put() to decrement the node's refcount and avoid leaking memory.
If the call to kzalloc() for 'mgmt' fails, the probe returns without
decrementing the refcount.

Use the automatic cleanup facility to fix the bug and protect the code
against new error paths where the call to of_node_put() might be missing
again.

Cc: stable@vger.kernel.org
Fixes: 1c9e16b731 ("staging: vc04_services: vchiq_arm: Split driver static and runtime data")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Link: https://lore.kernel.org/r/20241014-vchiq_arm-of_node_put-v2-2-cafe0a4c2666@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Javier Carrasco
2024-10-14 10:56:37 +02:00
committed by Greg Kroah-Hartman
parent 70777a23a5
commit 7d4fb115fb
1 changed files with 2 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+2 -4
View File
@@ -1715,7 +1715,6 @@ MODULE_DEVICE_TABLE(of, vchiq_of_match);
static int vchiq_probe(struct platform_device *pdev)
{
struct device_node *fw_node;
const struct vchiq_platform_info *info;
struct vchiq_drv_mgmt *mgmt;
int ret;
@@ -1724,8 +1723,8 @@ static int vchiq_probe(struct platform_device *pdev)
if (!info)
return -EINVAL;
fw_node = of_find_compatible_node(NULL, NULL,
"raspberrypi,bcm2835-firmware");
struct device_node *fw_node __free(device_node) =
of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware");
if (!fw_node) {
dev_err(&pdev->dev, "Missing firmware node\n");
return -ENOENT;
@@ -1736,7 +1735,6 @@ static int vchiq_probe(struct platform_device *pdev)
return -ENOMEM;
mgmt->fw = devm_rpi_firmware_get(&pdev->dev, fw_node);
of_node_put(fw_node);
if (!mgmt->fw)
return -EPROBE_DEFER;